Current Electricity and Electrical InstrumentHard
Question
The supply voltage to a room is 120V. The resistance of the lead wires is 6Ω. 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?
Options
A.zero Volt
B.2.9 Volt
C.13.3 Volt
D.10.04 Volt
Solution
So change in voltage = V1 - V2 
10.4 Volt
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