Question

electric bulb is rated 220V-100w, the bulb is used in 100v. Find the power so consumed

Answer 1

Explanation:

since Given

p=100w

v=220v

so p=v²/r

220*220/100=r

484=r

again

p=?

v=100v

r=484ohm

p=v²/r

p=100*100/484

p=20.66w

Answer 2

Power consumed in the bulb will be 20.66 watt

Explanation:

We have given rating of bulb V = 220 volt and power = 100 watt

We know that power is given by $P=\frac{v^2}{R}$

So resistance of the bulb will be $R=\frac{v^2}{P}=\frac{220^2}{100}=484ohm$

Now is given that bulb is used in 100 volt

So power at this voltage $P=\frac{v^2}{R}=\frac{100^2}{484}=20.66watt$

So power consumed in the bulb will be 20.66 watt

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