Question

The power of two electric bulbs are 100W and 200W which are connected to power supply of 220v the ratio of resistance of the filaments will be

Answer 1

Explanation:

P= V × I and P= V²/R

p is power, v is potential, and I is the current.

given

P1 = 100W , P2 = 200W,. V= 220 v

putting on formula,

100= 220 × 220/R

R1 = 484 ohm

and 200= 220×220/R

R2= 484/2

R2= 242 ohm.

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