Question

If 1 and 2 be the resistance of the filament of 40W and 60W respectively

operating 220V, then

(a) 1 < 2 (b) 2 < 1 (c) 1 = 2 (d) 1 ≥ 2​

Answer 1

Explanation:

we know R=v×v/P

Now when resistance =1 p=40 and v= 220

then R=48400/40

R= 1210ohm( resistance of resistor 1)

Now when P=60. V= 220 then R= 220×220/60

R= 806.7 (resistance of resistor 2)

hence 1210 >806.7

1>2.

Answer 2

Answer:

we know R=v×v/P

Now when resistance =1 p=40 and v= 220

then R=48400/40

R= 1210ohm( resistance of resistor 1)

Now when P=60. V= 220 then R= 220×220/60

R= 806.7 (resistance of resistor 2)

hence 1210 >806.7

1>2.

Explanation: