two lamps 'a' rated 100 watt 220 and b rated 60 watt 220v are connected in series to b electric main supply of 220v. the ratio of the heat produced in lamp a to the lamp b
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1
Answer:
Option A
Explanation:
Supply voltage, V=220V
Lamp A :-
Power , P
A
=100W
Voltage, V
A
=220V
Resistance, R
A
=
P
A
V
2
=
100
220
2
=484Ohm
Lamp B:-
Power, P
B
=60W
Voltage, V
B
=200V
Resistance, R
B
=
P
B
V
2
=
60
220
2
=
6
4840
Ohm
Ratio of heat produced ,
H
B
H
A
=
I
2
∗R
B
I
2
∗R
A
=
4840/6
484
=
10
6
=
5
3
(Current will be same as both are in series)
Hence ratio of heat produced in the lamps A and B is 3:5.
Option A
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