Question

An electric bulbbis rated to 220v and 100w .When its iperted at 110 v power cinsumed will be

Answer 1

Answer:

In case i,

Power (P)= 100W

Potential difference (V)= 220V

Now, we know,

P=VI (where I is the current)

100=220×I

=I=100/220

=5/11 A

Now in case ii,

Current (I)= 5/11 A (from case i)

Potential difference (V)= 110V

Now, P=VI

=P=110×5/11

=10×5

=50W