Question

An electric bulb rated 220V, 60W is working at full efficiency. Another identical bulb is connected in the same circuit having power supply of 220V.
(I) If both the bulbs are connected in series then the total power consumption will be 60W.
(ii) If only one bulb is connected in parallel then the total power consumption will be 30W.
(iii) If both bulbs are connected in parallel then the total power consumption will be 120W.
Which of the above statements is/are correct regarding the circuit?

Answer 1

ii) If both bulbs are connected in parallel then the total power consumption will be 120W.
Which of the above statements is/are correct regarding the circuit?

Answer 2

Hey there,

● Answer-

(iii) If both bulbs are connected in parallel then the total power consumption will be 120W.

● Explaination-

# Given-

P1 = 60 kW

P2 = 60 kW

# Solution-

Power consumption for bulbs connected in parallel,

Pp = P1 + P2

Pp = 60 + 60

Pp = 120 kW

Power consumption for bulbs connected in series,

Ps = P1.P2/(P1+P2)

Ps = 60×60/(60+60)

Ps = 30 kW

Hope you understand...