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Last Updated On 16-03-2023 - By Jeesha Sara

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

a)

No change

b)

10 V

c)

20 V

d)

More than 10 V


Question ID - 150357 :-

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

a)

No change

b)

10 V

c)

20 V

d)

More than 10 V

1 Answer
5876 Votes
3537

Answer Key : (d) -

(d)

Current

Voltage across bulb

Resistance of parallel combination

Total resistance

Current

Voltage across parallel combination

Change in voltage V.



Next Question :

Two bulbs consume same power when operated at 200 V and 300 V respectively. When these bulbs are connected in series across a DC source of 400 V, then the ratio of power consumed across them is

a)

2/3

b)

3/2

c)

4/9

d)

9/4


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