Which has greater resistance - 100W bulb or a 60W bulb both operated at 220V.....??
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⇒using P = VI
also V = IR
I = V/R
So , P = V²/R
⇒ Now , For 100W bulb
⇒ P = 100W
⇒ V = 220V
∵ R =V²/P = 220×220/100
⇒ R = 484Ω
Now , For 60W bulb
⇒ P = V²/R
⇒ R = 220×220/60 =806.666Ω
∴ A 60W bulb will have higher resistance than a 100W bulb
also V = IR
I = V/R
So , P = V²/R
⇒ Now , For 100W bulb
⇒ P = 100W
⇒ V = 220V
∵ R =V²/P = 220×220/100
⇒ R = 484Ω
Now , For 60W bulb
⇒ P = V²/R
⇒ R = 220×220/60 =806.666Ω
∴ A 60W bulb will have higher resistance than a 100W bulb
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