Question

A torch bulb is rated 3V; 2W. Calculate (a) its resistence (b) the energy consumed if this bulb glows for 10 hours.

Answer 1

given

P = 2W

p.d = 3V

r = ?

we know ...

P = v^2 / r

2 = 3 ^2 / r

2 = 9 / r

r = 9 / 2

r = 4.5 ohm

energy consumed = p × t

= 2 × 10

= 20 watt in 10 hr

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