Question

A circuit with a resistance of `7 Omega` has a fuse melts at `6 A`. Can a voltage of `49 V` be applied to the circuit without blowing the fuse?

Answer 1

`No`

Explanation:

Data:-

Resistance`=R=7Omega`

Voltage`=V=49V`

The fuse has capacity of 6A

Sol:-

If we apply voltage `V` across a resistor whose resistance is `R` then the current `I` flowing across it can be calculated by

`I=V/R`

Here we are applying voltage of `49V` across a `7Omega` resistor, therefore, the current flowing is

`I=49/7=7` `implies I=7A`

Since, the fuse has capacity of `6A` but the current flowing in the circuit is `7A` therefore, the fuse will melt. Thus, the answer to this question is `No`.