A little question about voltage! I can t figure it out, and I want to answer.

It is the amount of electricity discharged, not the voltage, that electrocuts a person. Although the instantaneous voltage of the baton is high, the power is not large, so it will not injure or cause death. However, the electricity supplied by the wires used daily is continuous, so it can electrocute people.

One of the functions of the safety gate is that it is blown when a person is electrocuted, so as not to electrocute people to death, so there are very few people who are electrocuted now.

Quite simply, this is because although the voltage of the electric rod is very high, the current is very small, and it can only corona people in an instant without life-threatening. The 220V current at home is very large, and it is alternating current, and the electric rod is direct current!

The electric rod is only an instantaneous voltage, and the household point is low, but it is continuous, and the low voltage is converted into a high voltage transformer.

That's understandable! Although the voltage of the electric baton is high, the energy is not large. Not enough to burn out a person's organs.

I'll give you an example: a flame, for example, can be as hot as it gets. If you put your hand in the fire and remove it quickly, your hand will not be burned.

But if you put your hands in 70 degrees of water, your hands will definitely be burned if you stay for a certain amount of time. The electric baton is like a flame, although the voltage is high, but when it comes into contact with the human body, the high voltage will quickly decrease. It's like feeling a burn in your hand in a fire, and before you can get a real injury, the voltage becomes very low.

Because people's nerves are very sensitive, they can't stand it.

The voltage of the police baton can reach millions of volts. But why can only put people.

What about dizziness, but electricity doesn't die?

Generally speaking, there is not enough electrical energy due to human beings!!

Usually, 220 volts of electricity at home can kill people if you are not careful. And electric bars in the hundreds.

The police electric baton is 'electric shock'!! The current is very small !!

You must first understand a truth, the fundamental condition of electrocution is the amount of current flowing through the human body and the duration of the human body parts to decide, that is to say, even if the 220v two wires are passed to the palm of the hand (of course, the part of the human body station should be insulated from the earth), the electricity will burn the hand, the duration can become disabled, but it will not electrocut, usually the human body electrocution is the current through the most sensitive heart part of the human body, (in fact, the current passes through the hand, through the heart, to the foot to the earth, or between the two hands) The electric rod is a defense**, The maximum current limit is limited when designing, and the defense has provisions on the parts of the human body, so it is not allowed to electrocute people, and it is not allowed to electrocute people, the high voltage in the electric rod is obtained by the way of voltage transformation (boost), and the piezoelectric igniter in the lighter can also reach 10,000V voltage, but the current is very small, so there is only the feeling of numbness, in addition, it is necessary to know that the electric death, DC and AC are the same, it is unscientific to measure whether the electric death can be measured by energy, and the voltage of hundreds of thousands of volts (electric rod) although the output current is not high, But its energy can completely exceed the energy of 220V and 10 mA.

Update 1:Will the battery voltage be equal to the load voltage?

It refers to the battery in a non-working state, that is, when the circuit has no current flowing through.

The potential difference between the positive and negative poles of the battery. In general.

When the li-ion is fully charged, the open-circuit vertical dispersion voltage is about the same.

After discharge, the opening pressure is left and right.

The open-circuit voltage through the battery.

It is possible to determine the state of charge of the battery. In solar panels there is an open circuit voltage, short circuit current, peak voltage, peak current, peak power.

If it were simple.

The open-circuit voltage refers to the voltage when the battery is not connected to the circuit, and it can also be regarded as a high electromotive force. Short-circuit current refers to the current when an electrical appliance is not in use.

It is equivalent to the current when you directly find a wire to connect the positive and positive couplings of the battery. Peak voltage, peak current, and peak power correspond to alternating current.

Direct current is the peak. Peak, as the name suggests, is the maximum.

For example, if we use a point 220, it is actually a valid value.

Then our peak usage should be 318. The closed-circuit voltage is the voltage of the battery when it is connected to a load.

Short-circuit voltage? I haven't heard of it.

Maybe it's a mistake.

It should be a short-circuit current. 2011-02-28 23:56:

28 Supplement: Of course, the voltage of the battery is the same as the voltage of the load Yu or Shi, if the voltage of the battery is in the open circuit, when there is a load, it is because there is a resistance inside the battery, so there will be a voltage drop phenomenon, of course, the load is.

1. This problem is the basic composition of the circuit, and it is necessary to be familiar with the drawing and connection of electrical components such as electrical appliances, ammeters, and voltmeters.

I don't need to talk about the basic composition of the circuit, the ammeter is to measure the current, and it needs to be connected in series in the circuit, which is equivalent to the current flowing through the ammeter.

Voltmeters are connected in parallel in a circuit and can be seen as measuring the potential difference between two points. Fully compliant with the definition of voltage. I hope you understand.

2. Judge which voltage the voltmeter is measuring, because the voltmeter is connected in parallel in the circuit, so when the voltmeter is connected in parallel with which part of the circuit (electrical appliances), then it measures which part of the voltage.

1. In China's mains power supply system, the voltage between the live wire and the live wire is 380V;

2. The voltage between the live wire and the neutral wire is 220V;

3. The center point is the point where the three-phase windings of the three-phase power transformer are connected together when the three-phase windings are connected for star wiring;

4. The voltage between the center point and the live wire is 220V;

5 The voltage between the center point and the neutral line is 0V. Because the zero line is important to be drawn from the center point.

Fire-to-fire is 380V, called line voltage. Fire to zero means that the neutral point is 220V, which is called phase voltage. The neutral point is the connection point of the transformer's secondary star connection.

Fire-to-fire is 380V, called line voltage. Fire to zero is 220V, which is called phase voltage.

A system of equations can be listed using the branch voltage method and the nodal current method:

i1*1=i2*1+2………1)

i1+i2=4………2)

It can be obtained by substituting (1) from (2) to i2=4-i1.

i1*1=(4-i1)*1+2

i1*1=4*1-i1*1+2

2i1*1=4*1+2

i1=(4*1+2)÷(2*1)

The solution yields i2=2+1=3(a).

As can be seen from the figure, u=i1*1=3*1=3(v).

The answer is as follows, please refer to:

i1*1ω+2=i2*1ω

4a=i1+i2

Solution: i1=1a

i2=3au=i2*1ω=3a*1ω=3v

Let the middle branch current be i1 and the right branch current be i2, uo=i2*1

Column: 4=i1+i2i1=[(4-i1)*1-2] 1, obtain: 2i1=2, i1=1

i2=4-i1=3∴uo=3v

You can understand it this way: the internal resistance of the voltmeter is very large, so large that it is infinite, and grinding is only to open the circuit. You string the voltmeter into the circuit.

It is equivalent to opening the circuit, and the circuit will not work properly. If it is connected in parallel, it is equivalent to nothing being added and has no effect on the circuit. Therefore, the voltmeter can only be connected in parallel, not in series.

Of course, there is voltage in the power supply, and if there is none, it is not a power supply. If there is voltage alone, it is still not possible to form an electric ridge flow, and the positive and negative ends of it are connected with electrical appliances to form a path, so that the current will be generated under the effect of voltage difference.

Voltages are mostly connected in parallel in daily life.

Because each switch is separated in parallel, each switch controls the same pointer, so that if there is a broken electrical appliance, it will not affect other electrical appliances, and it can also be very clear that the electrical appliance is faulty, and if the liquid is connected in series, each electrical appliance will not be able to use the rated voltage, and the work will not be normal. Because the large electrical appliances at home are generally rated at 220V, the voltage from the power station to the home is generally 220V. There are also times when the total power is too large in series, causing disasters.

If there is no voltage in the power supply, it will not work. The wire is resistive, and when the voltage passes through the wire, the voltage drops on it and forms an electric current

The voltage of the small bulb that Xiao Li should buy is b:.

Generally, the batteries in the flashlight are connected in series, and the four dry batteries are, so the bulb should be chosen.

The bulb burns off as soon as the power is turned on.