Explain the power rating of a bulb, say 60W, what if the voltage changes

Explain the power rating of a bulb, say 60W, what if the
voltage changes

Question Posted / manojverma87

4 Answers
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Explain the power rating of a bulb, say 60W, what if the voltage changes..

Answer / abishekmittal

Answer 1. is correct. In addition to it, with the decrease
of voltage, current will also come down (V is directly
proportional to I for constant R). Hence the bulb will get
dimmed as the I^2R also gets reduced

Is This Answer Correct ?

14 Yes

3 No

Explain the power rating of a bulb, say 60W, what if the voltage changes..

Answer / suresh

IF THE BULB POWER HAVINE 60W MEANS ,I^2R IS 60W.IF VOLTAGE
DECREASED BELOW RATED VALUE .BULB WILL DIM.

Is This Answer Correct ?

12 Yes

5 No

Explain the power rating of a bulb, say 60W, what if the voltage changes..

Answer / victor

answers #1&2 are applicable only in purely resistive load,
ex. an incandescent bulb , so both were correct .

Is This Answer Correct ?

4 Yes

3 No

Explain the power rating of a bulb, say 60W, what if the voltage changes..

Answer / md. obaydur rahman

All the above answers are wrong because we know that for a
constant power rating,
P=V*I
i,e. I=P/V
From the above equation we can see that if the voltage
changes the current is also changed for a constant power
rating i,e. if voltage reduced the device draws more current
to consume its power rating and vice versa.

Is This Answer Correct ?

6 Yes

7 No

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