1 (a) Tf a bulb of rating 200 V/100 W is used at 100 volt then what will be the power of the
bulb?
(1) 50 W
(ii) 25 W
(ii) 100 W
(iv) 40 W.
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1 (a) Tf a bulb of rating 200 V/100 W is used at 100 volt then what will be the power of the
bulb?
(1) 50 W
(ii) 25 W
(ii) 100 W
(iv) 40 W.
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Given that bulb is rated 200 V/100 W hence maximum voltage = 200 V and power of bulb is 100 W.
Solution: P = V²/R
→ R = 200²/100
→ R = 400 Ω
New power;
→ P = V²/R
→ P = 100²/400
→ P = 25 Ω
Answer: Option (ii)