An electric bulb is marked $100 W, 250 V$ . How much current will the bulb draw, if connected to a $250 V$ supply?

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Solution

Step 1 Given data:
Power of electric bulb $= 100 W$
Voltage of electric bulb $= 250 V$
Step 2: Calculation of current
As we know, the power of electric bulb can be determined by using formula: $P = V I$ ,
Where, $P i s t h e P o w e r, V i s t h e V o l t a g e, I i s t h e C u r r e n t$
So, the value of current will be $I = \frac{P}{V} = \frac{100}{250} = 0.4 A m p .$
Hence, value of current drawn by the bulb will be $0.4 A m p .$

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