Question

.A electric bulb 40W-220V.The energy consumed in joules by the bulb and the time taken by the bulb to consume two kilowatt hour is​

Answer 1

Answer:

Solution

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Correct option is

D

10 W

Formula,

P=

R

V

2

→R=

P

V

2

=

40

220

2

=1210Ω

P=

R

V

2

=

1210

110

2

=10W