Question

What would decrease the resistance of wires carrying an electric current?

a. shorter wires
b. higher-temperature wires
c. darker-colored wires
d. thinner wires

Answer 1

shorter wires

Step-by-step explanation:

Resistance, R = ρL / A

where R = Resistance, ρ = constant called Resistivity, L = Length and A = Area,

From the formula, above, the Resistance R would decrease if the length is small.

Answer 2

Shorter wires

Step-by-step explanation:

The formula used to find the resistance of wires carrying electric current is given by :

`R=\rho (l)/(A)`...............(1)

Where

`\rho` is the resistivity of the substance

l is the length of the wire

A is the area of cross section

From equation (1), it is clear that the resistance of the wire is directly proportional to its length. So, by decreasing the length of the wire, the resistance of the wire decrease. Hence, the correct option is (a).