Question

A current of 4 ampere flows in a wire of resistance 60 ampere. Calculate [a] potential difference across the wire

Answer 1

Answer:

V=240volt

Explanation:

As current is given as 4amp

Resistance 60ohm

Thus power dissipation (P) is given as

P=V^2/R

Or P=i^2*R

Thus we must use the 2nd formulae

Now

P=4*4x60=960Watt

Now for potential diff(V) we must use the 1st formulae.

P=V^2/R

960=V^2/60

V^2= 960x60

V=240volt

Now power=rate of change of energy per unit time

Power=energy/time

960=energy/(2/60)

Energy =130J