How Does The Temperature Affect The Resistance Of A Wire?

What four things does the resistance of a wire depend on?

The resistance of a given piece of wire depends of three factors: the length of the wire, the cross-sectional area of the wire, and the resistivity of the material composing the wire.

To understand how this works, think of water flowing through a hose..

Is Temperature directly proportional to resistance?

Resistivity is indirectly proportional to the temperature. In other words, as you increase the temperature of materials, their resistivities will decrease.

How does resistance change with temperature?

The general rule is resistivity increases with increasing temperature in conductors and decreases with increasing temperature in insulators. … As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance goes up.

What happens to the resistance of a wire as its length increases?

There is a resistance to the flow of an electric current through most conductors . The resistance in a wire increases as: the length of the wire increases. the thickness of the wire decreases.

Does diameter affect resistance?

As the diameter of the wire increases, the resistance decreases. In fact, if we double the cross-sectional area then the resistance halves. This means that resistance is inversely proportional to the area of the wire.

What are the factors that affect resistance?

There are several factors that affect the resistance of a conductor;material, eg copper, has lower resistance than steel.length – longer wires have greater resistance.thickness – smaller diameter wires have greater resistance.temperature – heating a wire increases its resistance.

Which of the following will increase the resistance of a wire?

Increasing the resistivity of the material the wire is composed of will increase the resistance of the wire. Increasing the cross-sectional area of the wire will increase the resistance of the wire. Increasing the length of the wire will increase the resistance of the wire.

Why does temperature affect the resistance of a wire?

The resistance of a metal conductor is due to collisions between the free electrons of the electric current and the metal ions of the wire. If the temperature of a metal conductor increases, the ions of the metal vibrate more vigorously. … Hence, for a metal, resistance increases with increasing temperature.

Do hot or cold wires have more resistance?

A cooler wire has less resistance than a warmer wire. Cooler particles have less kinetic energy, so they move more slowly. Therefore, they are less likely to collide with moving electrons in current. Materials called superconductors have virtually no resistance when they are cooled to extremely low temperatures.

How does area of a wire affect resistance?

More collisions mean more resistance. Second, the cross-sectional area of the wires will affect the amount of resistance. Wider wires have a greater cross-sectional area. … In the same manner, the wider the wire, the less resistance that there will be to the flow of electric charge.

Does resistance depend on temperature?

Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself, the resistance depends on temperature. With increasing temperature, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current.

Why does the resistance of a thermistor decreases as temperature increases?

At zero temperature, no charges are in the conduction band and the resistance should be infinite as the system behaves basically like an insulator. If you turn on the temperature, some electrons will start to occupy the conduction band and thus contribute to conduction, lowering the resistivity.