The smaller the current through a conductor, the greater the resistance of that conductor. Why is t

, the current is equal to the voltage divided by the resistance, here if the voltage is small, the current is also small. If this sentence says this: the smaller the current through a conductor at the same voltage, the greater the resistance of that conductor must be. Then that's right.

2.Readings are for the supply voltage.

3.The voltage is the same as the voltage of 1 battery (if the voltage of both batteries is the same)4The bulb does not light up because the broken bulb is broken and the whole circuit is not connected, and the good bulb is connected to the power supply pole, if the voltmeter is connected in parallel to the bad bulb, then the whole circuit is the voltage of the power supply voltage.

If it is an open circuit caused by a bad bulb on a good bulb, the voltmeter has no indication.

1 The reason for the small current is not only affected by the resistance, but also by the voltage size, the current is small, probably because the voltage is small, so it is of course wrong to say that the resistance is large.

2 There will be a large internal resistance in the voltmeter, and the voltmeter is likely to indicate the voltage value of your power supply.

3 2 power supplies in parallel There is only one power supply effect.

4 It turns out that there is no indication for the series of 2 bulbs in series, which proves that the loop is broken, and when the broken bulbs are connected in parallel, a loop is formed, and the current is generated. On the contrary, when the bulbs are connected in parallel, the open circuit is still open, no current is generated, and of course the voltmeter does not have an indication.

1.If the voltage is constant, it is correct.

2.In junior high school, it can be considered that the reading is the mains voltage.

3.Parallel connection is adopted.

4.The principle is the same as in series 2.

This statement is not correct, resistance is a property of the conductor itself, its size is determined by the length of the conductor's material and cross-sectional area, and is also affected by temperature, independent of the voltage applied at both ends of the conductor and the current passing through it.

In general, resistance is an intrinsic physical property of a circuit (or a part).

Therefore, it is generally believed that the higher the voltage applied to the resistor, the greater the current flowing through the resistor.

By Ohm's law, of course.

It is known that the relationship between the voltage applied at both ends of the resistor, the magnitude of the resistance and the magnitude of the current flowing through the resistor is: the magnitude of the current flowing = the resistance value of the voltage at both ends of the resistor; Therefore, when the voltage at both ends of the resistor is constant, the current flowing through the resistor is inversely proportional to the resistance value of the resistance (the resistance increases and the current decreases); When the resistance value is constant, the current flowing through the resistance is proportional to the voltage applied at both ends of the resistance (the voltage increases, the current increases); When the current flowing through the resistor is constant, the greater the resistance value, the higher the voltage applied to the resistor (the voltage is proportional to the resistance value).

When the voltage is constant, the current in the conductor is inversely proportional to the resistance of the conductor, and the greater the resistance, the smaller the current; When the current is constant, the voltage in the conductor is proportional to the resistance of the conductor, and the greater the resistance, the greater the voltage. At a certain resistance, the current in the conductor is proportional to the voltage across the conductor.

The resistance of a conductor to an electric current is called the resistance of the conductor. Resistance is a physical quantity.

In physics, it is expressed as the magnitude of the effect of a conductor on the resistance of an electric current. The greater the resistance of a conductor, the greater the resistance of the conductor to the current. Different conductors, the resistance is generally different, and resistance is a property of the conductor itself.

The resistance of a conductor is usually represented by the letter r, and the unit of resistance is ohm, or short as .

Resistance is a physical quantity that describes the electrical conductivity of a conductor and is denoted by R. The resistance is defined by the ratio of the voltage u at both ends of the conductor to the current i through the conductor, i.e., r=u i, so when the voltage at both ends of the conductor is constant, the greater the resistance, the smaller the current passing through; Conversely, the smaller the resistance, the greater the current that will pass through.

Therefore, the size of the resistor can be used to measure the strength of the conductor's resistance to the current, that is, the conductivity. The amount of resistance is related to factors such as the material, shape, and volume of the conductor, as well as the surrounding environment.

Not to empty books or gestures.

According to i = u r, when the voltage u is constant, the greater the resistance r, the smaller the current i.

All conductor resistances, according to the formula: r = l s, at the same length, the smaller the cross-sectional area, the greater its resistance? Ask for more details!

You can think of the conductor "copper wire" as a "water pipe": 1. The water pipe used by your family to supply water may be 20mm in diameter, and the water supply is very smooth, we say that the water pipe has little resistance to the water; 2. If you replace this water pipe with a diameter of 2mm, you will find that there is not enough water. 3. We say:

The cross-sectional area of the water pipe becomes smaller, so the resistance to the water becomes greater. 4. The resistance of the conductor wire is the same as the resistance of the water pipe to the water, and the smaller the cross-sectional area s, the greater their resistance value. 5. The longer the wire l and the longer the water pipe, the greater the resistance.

6. The current is not visible, but the water flow is visible, which is more intuitive and easy to understand. 7. Others: voltage and water pressure, potential and water level, current and water flow, all have many similarities in the principle of the situation, which can be learned by reference.

Factors that affect the magnitude of resistance: material, length, cross-sectional area, temperature.

1. Materials

The electrical resistance of conductors of different materials is generally different.

2. Length

For conductors of the same material and the same thickness, the longer the length, the greater the resistance; The shorter the length, the lower the resistance.

3. Cross-sectional area

For conductors of the same material and the same length, the larger the cross-sectional area, the smaller the resistance; The smaller the cross-sectional area, the greater the resistance.

4. Temperature

All other factors being equal, in general, the resistance becomes larger when the temperature rises and decreases when the temperature decreases.

Resistor Introduction:

Resistance (usually denoted by "R") is a physical quantity that represents the magnitude of a conductor's resistance to an electric current. The greater the resistance of the conductor, the greater the resistance of the conductor to the current.

The resistance of different conductors is generally different, and resistance is a characteristic of the conductor itself. Resistance will cause a change in the flow of electrons, and the smaller the resistance, the greater the flow of electrons, and vice versa. Whereas, superconductors have no electrical resistance.

The resistance of a conductor is usually represented by the letter r, and the unit of resistance is ohm, referred to as ohm, and the symbol is . Resistance is a physical quantity that describes the electrical conductivity of a conductor and is denoted by R. The resistance is defined by the ratio of the voltage u at both ends of the conductor to the current i passing through the conductor, i.e., r=u i.

Therefore, when the voltage at both ends of the conductor is constant, the greater the resistance, the smaller the current passing through; Conversely, the smaller the resistance, the greater the flow of electrical stupidity through it.

(1) False.

Because the current in the conductor does not determine the magnitude of the resistance, the magnitude of the resistance value is determined by the material and geometry of the resistor.

2) Right. According to Ohm's law i = v r of a partial circuit, it can be decided.

1 wrong r = u i, only u a certain time, the greater the current through the conductor, the smaller its resistance, do you want you to let a copper wire and a No. 5 battery form a series, and lightning to the trees and the earth to form a series, obviously the lightning current is large, but is the resistance of the copper wire greater than that of wood? Not right, 2 pairs.

2 is right.

1. In the case of the same voltage, the greater the current through the conductor, the smaller its resistance.

Because no matter what kind of material the conductor is made of, there is still resistance to some extent. In particular, the resistance of long-distance wires cannot be ignored, such as power transmission lines.

Any conductor has a resistance that acts as a barrier to the current.

Unless it's a superconductor.

That's right. Any conductor has a resistance that acts as a barrier to the current.

Unless it's a superconductor.

The correct statement is: cWhen the voltage across the conductor is zero, the current is zero, but the resistance is not.

Because as long as the conductor is certain, its resistance is certain, and it does not change with the change of current or voltage. So, C is correct.

I can't answer if I can't tell it!

Hello: This statement is not correct, it should be said like this: the greater the resistance in the conductor, the more heat generated by the current passing through the conductor per unit time!

The heat q generated by a conductor is proportional to the square of the current passing through the conductor, proportional to the magnitude of the resistance, and proportional to the time of energizing.

q=i^2rt

Incorrect. q=i^2rt。Only when the current i is constant with t, the greater r is, the q is greater.

1.Electrical appliances consume electricity.

2.Because there is resistance in electrical appliances.

3.The series circuit is a voltage divider circuit, in the series circuit, the greater the resistance, the more voltage because the series circuit i is the same u=i*r r is large u large parallel circuit is a shunt circuit, in the parallel circuit, the smaller the resistance, the more current is divided because the parallel circuit u is the same i=u r r small (when the voltage is constant, of course, the greater the resistance, the smaller the current, but in the series circuit, the current must be equal, so you should use u=ir, the current is equal of course, the voltage with large resistance, for example, a road, That intersection is blocked, people are blocked there, and that place is stressed, just like the ticket gate of a train station. )

There is no change in voltage because the voltage is given by the power supply.

Electrical appliances convert electrical energy into other forms of energy, of course, electrical energy.

There is resistance in electrical appliances, and through the resistance, the current becomes smaller.

Electrical energy is inherently related to current and voltage.

What should be consumed by electrical appliances is electrical energy.

The electrical appliance has a resistor, which blocks part of it, and the electrical appliance will also consume one step of electricity.

In the end, I didn't learn either.