Question

A circuit with a resistance of `7 Omega` has a fuse melts at `6 A`. Can a voltage of `21 V` be applied to the circuit without blowing the fuse?

Answer 1

Yes

Explanation:

This is an application of Ohm's Law, which states that the voltage `V = I*R` where `I` is the current and `R` is the resistance.

`21 = I*7` to calculate what current the stated voltage will produce.

`I=21/7 = 3A`

`3A < 6A`

There fore the fuse will not blow.