Question

State which has a higher resistance -a 50 watt or a 25 watt lamp bulb and how many times?

Answer 1

V * I = P , where P is power, V is voltage, I is current
also, V=I.R
=> I²R = P
i.e, Resistance increases with increase in Power

∴ bulb with more power (i.e, 50watt) has more resistance and 50/2 = 2 times more.....



hope it helps....

Answer 2

Answer: 2times

Explanation:

P = V * I

I = V/R

So, P = V²/R

As V is constant

Hence P is inversely proportional to R

Let the resistance of 25W bulb be R1

And resistance of 50 W bulb be R2

So R1/R2=25/50

HENCE R1 HAS HIGHER RESISTANCE