Last Updated On 01-06-2023 - 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
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
|
The main supply voltage to a room is 120 V. The resistance of the lead wires is 6 |
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|
a) |
No change |
b) |
10 V |
c) |
20 V |
d) |
More than 10 V |
(d)
.png)
Current 
Voltage across bulb
.png)
Resistance of parallel combination
Total resistance 
Current 
Voltage across parallel combination
Change in voltage 
V.
Next Question :
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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 |
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|
a) |
2/3 |
b) |
3/2 |
c) |
4/9 |
d) |
9/4 |
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