Question

A bulb is marked 220 V and 40 W. Calculate the current flowing through the
bulb and its resistance.

Answer 1

Answer:

The current flowing through the bulb and its resistance​ is 0.18 A and 1210 ohms respectively.

Explanation:

Use the formula:

P= VI

40= 220×I

I= 40/220=2/11 A = 0.19(approx.)

Now for resistance,use this formula:

V= IR

220=2/11×R

R=220×11/2=110×11=1210 ohm.

Current= 0.19A (approx)

Resistance= 1210 ohm ...

Answer 2

Answer:

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Explanation:

i=p/v

i=220/40

i=0.18A