The supply voltage to room is 120 V. The...

The supply voltage to room is 120 V. The resistance of the lead wires is `6Omega`. A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?

A

zero

B

2.9 volt

C

13.3 volt

D

10.04 volt

Text Solution

Verified by Experts

The correct Answer is:

D

`P=(V^(2))/(R)`

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