Will a person be electrocuted if the current is high and the current is small, and the voltage is la

Your question should be: Will a person be electrocuted if the current is high and the voltage is small, and the voltage is large?

This is a conceptual problem, for people, the voltage is low and there will be no large current, such as a rechargeable battery, the voltage is very you, such as a short circuit when the current is very large, but for people there is no problem (there is not much current for people).

In addition, the problem of high voltage and small current, we must also be clear that high voltage is not directly to people. For example, the static electricity on the clothes, the voltage is high, but it is not right (that is to say, the two ends of the high voltage are not reliably connected, if the high voltage is reliably connected, it cannot produce such a high voltage), when discharging, even if it is touched at the same time, due to the limited energy, there is no long-term high current (there is temporary, sometimes it still hurts), and there is no problem.

Of course, it depends on how you understand it. If you only talk about the voltage added to the human body, as long as it does not exceed the safe voltage of 36V, it is generally not harmful to people. In terms of the current through the human body, it is dangerous to reach a current of 5-10mA.

The higher the current, the greater the harm. This is mainly related to the human body's resistance, the average person's resistance is 2,000 ohms to 20 megaohms, and the blood resistance is about 500 ohms, so when the human body resistance is 2,000 ohms, when the voltage added to the human body is 36V, the current through the human body reaches 18mA, which is also very dangerous. Therefore, the judgment of electric shock is mainly judged by the current flowing through the human body, as long as it can reach 1ma, you will have a feeling, which has an ohm's law with your ** resistance and the voltage applied.

You can't, but you can't tell which is safe from the high voltage or the high current.

It doesn't matter how big or small the voltage is. The current is important. The electric current will electrocute the man.

There is no direct relationship between current and voltage. Under certain conditions, the higher the current, the greater the voltage. According toOhm's Lawi = u r, the higher the voltage u, the greater the current i when the resistance r is constant.

According to the formula for calculating i=p u, the higher the voltage u, the smaller the current i when the power p is constant.

Broadly speaking, under certain conditions, there must be a voltage if there is a current, and there must be a current if there is a voltage. In a narrow sense, there must be a voltage if there is a current, and there is not necessarily a current if there is a voltage.

Characteristics of voltage and current

The direction of the voltage is specified as the direction from the high potential to the low potential. Volt.

is the SI unit of voltage.

Abbreviated as volt, represented by the symbol v, it is a physical quantity that measures the energy difference between a unit charge in an electrostatic field due to different electric potentials.

The magnitude of the current is the amount of electricity (current intensity) that passes through the cross-section of the wire per unit of time.

The formula usually uses a capital letter i to indicate the current. Q is used to denote the amount of electricity passing through the cross-section of the wire per unit time (indicated by the letter t).

The above content refers to Encyclopedia - Voltage.

You're talking about a very vague concept.

The key to the electric shock is because the human body has flowed an electric current. Whether it is a low voltage or a high voltage, the flow of electric current in the human body will cause harm.

Through a large number of data studies and experiments, it is possible to cause death (flowing through the heart) when the human body flows an electric current of 2 mA.

Since the resistance value of the human body is roughly within a range, the higher the voltage of the electric shock, the greater the current flowing through the human body, and the higher the probability of causing people. So high voltage is the culprit again.

There are many examples in life that can test this theory.

For example, if you touch the two electrodes of a 24V battery with both hands, you will not feel anything, and there will be an electric current flowing through the human body, but it is too small.

Another example is that the voltage of lightning is as high as hundreds of thousands of volts, and if you are hit by it, you will be seriously injured if you don't die. It shows that high voltage is applied to people, relatively speaking, it cannot be a small current.

In short, it is the electric current that hurts people, and the culprit is voltage.

Yes, whether it is a low voltage and high current or a high voltage and low current flowing through the human body, it may cause human resistance, the resistance in the human body is certain, and the current flowing through the human body under high voltage will be very large, which will cause damage, and the same is true for low voltage and high current.

Whether a person is electrocuted or not depends on the voltage. As long as the voltage is higher than 36V, it will cause an electric shock. So high voltage can electrocute people.

Low voltage and high current are all relative, and whether a person is electrocuted or not mainly depends on the current and part of the body flowing through the body.

The safety voltage of alternating current is 36V, which is calculated according to the resistance of the human body of the general population (generally greater than 1K), and practice has proved that the current of the human heart does not exceed 40mA, U=I*R, so if someone has a particularly small resistance, 36V may not work. The body's response to electric current:

8 10mA hands have difficulty getting rid of the electrodes and have a sharp pain (finger joints).

20 25mA hands quickly paralyzed, unable to get rid of electrodes automatically, breathing difficult.

50 80mA is difficult to breathe, and the atria begin to tremble.

90 100mA respiratory paralysis, after three seconds the heart begins to paralyze and stops beating.

Electrical injury is judged by the current of the human body, and higher than 200 milliamperes will cause harm to the human body.

As long as the lethal conditions are met, the person will be electrocuted.

Electric shock is caused by the direct contact of the human body with the power supply, and a certain amount of current passes through the human body, resulting in tissue damage, dysfunction and even death.

What works is the electric current and electric shock event, and the resistance of the human body is within a fixed range, so the current and voltage are proportional.

The key is how do you define high and low?

The smaller the voltage, the greater the combustion current for the following reasons:

This is because according to Ohm's law, the magnitude of the current is related to the ratio of voltage and resistance, i.e., i.e., i=u r. When the resistance does not change, the lower the voltage, the lower the current. At the same time, in some cases, the smaller the voltage, the greater the resistance within the circuit, resulting in a decrease in current.

Therefore, the relationship between voltage and current should be analyzed on a case-by-case basis, and it cannot simply be assumed that the smaller the voltage, the greater the current.

Voltage vs. Current:

The current is generated by the voltage, so there must be a voltage if there is an electric current.

Conversely, there is a voltage and there is not necessarily a current, for example, if a battery is placed on the ground, there is voltage on the positive and negative poles of the battery, but.

There is no current. Another example is that a conductor rod cuts the magnetic inductance line without a loop, which will produce an induced voltage but does not feel it.

should be current. Therefore, we have introduced the concept of resistance, and we also have the deterministic formula i=u r for current, which is determined by both voltage and resistance.

Certainly, you can't just look at one. The higher the voltage, the greater the current, and the greater the resistance, the smaller the current.

In the above two examples, both are because the voltage is present, but the virtual resistance is too large (the positive and negative poles are connected to a piece of air, resistance.

It is very large), so it is considered that the current generated is negligible, and as for the absence of voltage, it is okay if the object is not electrified. But there must be no current. <>

There is no direct relationship between voltage and current time, according to Ohm's law, the higher the voltage U, the greater the current i when the resistance is constant. There is no direct relationship between voltage and current time, not that the higher the voltage, the greater the current. According to Ohm's law, i = u r, the higher the voltage u, the greater the current i when the resistance is constant.

According to the formula of i=p u, the higher the voltage u, the smaller the current i when the power p is constant.

There is no direct relationship between the voltage and the current itself, and only under special conditions will the current increase and the voltage will increase. In order to ensure the safety of electricity, when using electrical appliances, we should check whether the voltage at home is normal, if the voltage is too large, it is easy to produce electric shock accidents, which will cause danger to people's life safety.

What is the harm of electric current to the human body.

1. There is an electric shock accident.

Electric shock is a common accident, if the human body is in direct contact with a live object, a large current will pass directly through the human body, which will cause damage to human organs and tissues, respiration, nervous system, etc. Among electric shocks, the most dangerous is electrocution, and in most cases of electrocution deaths, it is caused by electric shock.

2. Electrical injury.

In addition to electric shock, there is also a phenomenon of electric injury is also more common, although this harm is not as serious as electric shock, but it will also cause some damage to the outside of the human body, if the electrical injury is not serious, its manifestations are mostly burns, metallization and other phenomena, if the electric injury is more serious, it will also directly cause death.

Electric current damage is related to those factors.

It has a lot to do with the magnitude of the current, the value of resistance, the time of electric shock, the frequency of the current, etc. If the current passing through the person is larger, the stronger the feeling of electric shock in the human body, the greater the damage caused, and the greater the possibility of fatality. In order to ensure the safety of electricity, we should take safety protection measures when using electrical appliances or repairing circuits to reduce the occurrence of safety accidents.

Normal household appliances are voltage greater than current, because if the current is greater than the voltage, then the load resistance value must be less than 1 ohm, for a single household appliance, it is basically impossible, because if the resistance value of an electrical appliance is less than 1 ohm, then its power is at least 48kw or more, there is no such a high-power household appliances, even if a family's electrical appliances are fully opened, it is not so big! However, in low-voltage power supply and distribution systems and industrial equipment, the current is often greater than the voltage. Therefore, this specific depends on the use scenario and power structure, but ordinary people are generally exposed to voltage greater than current!

1. The relationship between voltage and current.

What is the relationship between voltage and current, current is formed due to the directional movement of free charge, voltage is the potential difference, it is provided by the power supply, the role of voltage and current is not the same, let's understand the relationship between current, voltage, resistance and power.

The current can be compared to the image of the water flow, the electric potential is like the height, the current flows from the high potential to the low potential, just like the water flows from the high to the low, the water with the same height will not flow, as if the electric potential is the same will not have the current, the voltage is the potential difference, the potential difference is zero is the voltage is zero, the role of the power supply is like a water pump, the water pump pumps the water from the low to the high place, and the power supply sends the carriers from the low potential to the high potential.

The relationship between voltage and current can be understood in this way: the same height and the same water pressure, there will be no water flow; Without a pump, all the water would go to the lowest point and there would be no flow.

Current: The amount of electricity passing through the cross-section of a conductor per unit time, i=q t, unit coulomb c.

Voltage: The work done by the electric field force when a unit charge moves from one point to another in an electric field, u=w q, unit v.

Voltage: The potential difference, which determines the direction of the current. Where there is current, there must be voltage. There should be no current if there is voltage. A large voltage does not necessarily have a large current.

Sometimes the battery is measured to have voltage, but it cannot be used for this reason.

Therefore, to determine whether the battery is used, the discharge current and voltage should be tested!

Second, the difference between current and voltage.

The electric current is formed due to the directional movement of the free charge. Current is a physical quantity that indicates the magnitude of the current, which is the amount of charge that passes through the cross-section of a conductor per unit time.

The voltage is the potential difference, which is provided by the power supply. The function of voltage is to cause the free charge in the circuit to move in a directional motion to form an electric current.

Therefore, in order to form a current in a circuit, there must be a voltage, and if there is a voltage, it is not necessarily a current, and to form a current, the circuit must also be a path.

Appendix 1, the relationship between current, voltage, resistance and power.

Power (watts) = current (amps) x voltage (volts);

Power = Voltage * Current.

Depending on the circuit structure, both can be used.

Low voltage and high current, if the voltage is lower than 36V, the high current will not flow through the human body and will not electrocute people.

For example, the battery has a current of 12V and 10A, and it will not hurt people. High voltage and low current, high voltage will make the human body have an electric current flowing, whether a person is electrocuted depends on the product of the size of the current through the human body and the time. For example, the high voltage in the picture tube TV is 10000V, even if the power is off, there is such a voltage when the fault occurs, and people will be electrocuted if they are not careful during maintenance, but the discharge current time is short, although there is the pain of being hit, it will not be electrocuted, but the high-voltage of the energized TV will definitely die if it is touched.

There is no direct relationship between current and voltage. Under certain conditions, the higher the current, the greater the voltage. According to Ohm's law i=u r, the higher the voltage u, the greater the current i when the resistance r is constant.

According to the formula for calculating i=p u, the higher the voltage u, the smaller the current i when the power p is constant.

Series circuit features

The switch controls the entire circuit at any location, i.e. its role is independent of its location. There is only one path for the current, and the current that passes through one lamp must pass through the other. If one light goes out, the other must go out.

Advantages: In one circuit, if you want to control all the circuits, you can use a series of circuits;

Disadvantages: As long as there is a disconnection, the whole circuit becomes an open circuit, that is, the electronic components connected in series cannot work normally;

Distinction: There are no bifurcations (branches) in series circuits.

Circuit rules. (1) The current flowing through each resistor is equal because each section of the same branch in the DC circuit has the same current intensity.

2) The total voltage (series circuit = voltage at both ends) is equal to the sum of the partial voltages (voltage at both ends of each resistor), i.e. u=u1+u2+......un。This can be derived directly from the definition of voltage.

3) The total resistance is equal to the sum of the sub-resistances. Applying Ohm's law to each resistor yields u1=ir1, u2=ir2, ,......un=irn is substituted for u=u1+u2+......un and note that the currents on each resistor are equal, giving u=i(r1+r2+rn). This equation illustrates that if a resistance value is r=r1+r2+.

The resistive element of RN replaces the original series circuit with n resistors, and the current of this element will be the same as that of the original series circuit. Therefore the resistance r is called the equivalent resistance (or total resistance) of the original series resistor. Therefore, the total resistance is equal to the sum of the partial resistances.

4) The voltage distributed by each resistor is proportional to its resistance value, because ui=iri.

5) The power distributed by each resistor is proportional to its resistance value, because pi=i2ri.

6) There is a bifurcation of the parallel circuit current.