A 220 V, 50 Hz AC source is connected to a 25 V, 5 W lamp and an additional resistance R in series (as shown in figure)
to run the lamp at its peak brightness, then the value of R (in ohm) will be__________.
A 220 V, 50 Hz AC source is connected to a 25 V, 5 W lamp and an additional resistance R in series (as shown in figure)
to run the lamp at its peak brightness, then the value of R (in ohm) will be__________.
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1 Answer
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for lamp,
R = 975
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