Question

A circuit with a resistance of `8 Omega` has a fuse with a capacity of `3 A`. Can a voltage of `28 V` be applied to the circuit without blowing the fuse?

Answer 1

No.

Explanation:

If the fuse can tolerate a maximum of `3A` of current (`I_c`), then the maximum voltage that can be put safely on the circuit is given as:

`V_c = I_c R`

Hence the maximum voltage, for this circuit with resistance (`R`) of `8Omega` is : `V_c = 3Axx8Omega = 24V`

As `28V>24V`, it will blow the fuse.