Question

One metre of a particular type of wire has a resistance of 30 Ω. What length of this wire will have a resistance of 6 Ω

Answer 1

Answer:

0.20 m.

Explanation:

Given: R = 30 Ω and L = 1 m

Resistance of 1m wire is R = V/I = 30Ω/0.1A

6Ω resistor will have the same voltage drop across it as 1m wire, so we require I to be 6A. Therefore, the required length of wire  is:

L = (6A)/(30Ω) = 0.2m