Question

If Resistance of 50 w Bulb filament is 9 ohm. then resistance of
75w Bulb filament will be​

Answer 1

Answer:

Use the formula P = VI, assume V to be a constant value

When P is 100W, Current(I) is higher

but when P = 60W, current is lower (remember that V is constant)

then use V = IR, when current is high, resistance is low

Hence 60 W bulb has a higher resistance than 100W bulb

As simple as it can get, no need all the scientific calculations that the other “over exaggerating” answers stated.

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Answer 2

Step-by-step explanation:

1. we have to take out V,since P=VI
2. therefore we get P=V²/R
3. since,P=50w ,R=9 ohm therefore on solving we get V=21.21 V
4. Now,P=V²/R and P=75w and V=21.21 ,we get
5. R=8.99ohm or 9 ohm