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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

`13.3` volt

B

`10.4` volt

C

zero volt

D

`2.9` volt

Text Solution

Verified by Experts

The correct Answer is:
B

`v_(1)=120/246,240=117.07`

`v_(2)=120/54, 48=106.67`
`Dv=v_(1)-v_(2)=117.073-106.67=10.4`
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