Question

Which of the following would double the amount of current flowing through a piece of metal wire? Which of the following would double the amount of current flowing through a piece of metal wire? Quarter the voltage across it. Quadruple the voltage across it. Double the voltage across it. Halve the voltage across it.

Answer 1

Answer:

Double the voltage across it.

Explanation:

From Ohm's Law, we have the relation, as follows:

Voltage = (Current)(Resistance)

If we keep the resistance of the wire as a constant, then we get the relation between voltage and current as follows:

Voltage = (Constant) * Current

Voltage α Current

This shows that the current has a direct proportionality with the voltage. So, if we want to double the current flowing through a piece of metal wire, then we must Double the voltage across it.

It can be confirmed by formula as:

V = IR

Now, doubling the voltage:

V' = 2 IR

substituting value of IR = V:

V' = 2 V