Question

Define resistance of a conductor. State the factors on which resistance of a conductor depends. Name the device which is often used to change the resistance without changing the voltage source in an electric circuit.
Calculate the resistance of 50\ \text{cm}50 cm50, space, start text, c, m, end text length of wire of cross sectional area 0.01\ \text{mm}^20.01 mm
2
0, point, 01, space, start text, m, m, end text, squared and of resistivity 5\times10^{-8}\ \Omega\text m5×10
−8
Ωm5, times, 10, start superscript, minus, 8, end superscript, space, \Omega, start text, m, end text.​

Answer 1

Answer:

The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature.

Resistivity is defined as the measure of the resisting power of a specified material to the flow of an electric current.

Explanation:

In the given circuit, the two 2Ω resistors are in series with each other and these resistors are in parallel with other two 2Ω resistors which are in series with each other.

Answer 2

Answer:

The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. Potentiometer are used often to change the resistance without changing the voltage source in an electric circuit.