Question:
The supply voltage to a room is $120 \mathrm{~V}$. The resistance of the lead wires is $6 \Omega$. A $60 \mathrm{~W}$ bulb is already switched on. What is the decrease of voltage across the bulb, when a $240 \mathrm{~W}$ heater is switched on in parallel to the bulb?
Correct Option: , 4
Solution:
