Question

A cross section of a wire made with the material of specific resistance 9 into 10 to the power minus 6 ohm- centimetre is 18 cm square what length of the wire will have a resistance of 1 into 10 to the power minus 3 Ohm​

Answer 1

Ohms Law states that when a voltage (V) source is applied between two points in a circuit, an electrical current (I) will flow between them encouraged by the presence of the potential difference between these two points. The amount of electrical current which flows is restricted by the amount of resistance (R) present. In other words, the voltage encourages the current to flow (the movement of charge), but it is resistance that discourages it.