What happens to the resistance of wire if it is stretched?

What happens to the resistance of wire if it is stretched?

The resistance of a wire is inversely proportional to its area and directly proportional to its length. When the length is tripled then resistance will also become three times. If The wire is stretched 3 times the original length, the cross-section of the wire is cut to 1/3rd it’s the original cross-section.

What is the resistance of a wire if the length is doubled?

What happens to resistance when length is doubled? From the equation, we understand that resistance is directly proportional to the length of the conductor and inversely proportional to the crossectional area of the conductor. Doubling the length doubles the resistance.

On what factors does resistance depend on?

The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.

What happens when resistance is increased?

The relationship between resistance and wire length is proportional . When resistance is increased in a circuit , for example by adding more electrical components , the current decreases as a result.

What is the resistance of insulator?

In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.

What is the effect of temperature on resistance of an insulator?

So, if the temperature rise is high, the electrons will go to the upper band. But since it is not crowded due to less number of electrons, so the conductance will increase due to availability of free electrons in the conduction band. So, the resistance decreases with increase in temperature in insulator.

What is effect of temperature on resistance for resistance derive an expression?

Actually in metal if the temperature increases, the random motion of free electrons and interatomic vibration inside the metal increase which result in more collisions. More collisions resist the smooth flow of electrons through the metal, hence the resistance of the metal increases with the rise in temperature.

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