# The supply voltage to a room is 120 V .

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?

1.  zero Volt

2. $2.9$ Volt

3. $13.3$ Volt

4.  $10.04$ Volt

Correct Option: , 4

Solution: