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Electric Energy and Power
Electric Energy and Power
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Advanced Knowledge of Electric Energy and Power
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Introduction to Electrical Energy and Power
13 mins
Joule's Law of Heating Effect
8 mins
Quick Summary With Stories
Introduction to Electrical Energy and Power
3 mins read
Power in Electric Circuit
2 mins read
Important Questions
An electric lamp of resistance
2
0
Ω
and a conductor of resistance
4
Ω
are connected to a
6
V
battery as shown in the circuit. Calculate:
(a) The total resistance of the circuit
(b) The current through the circuit
(c)The potential difference across the (i) Electric lamp and (ii) Conductor, and
(d) Power of the lamp.
Medium
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>
An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
Medium
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>
Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Hard
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>
An electric iron has a rating of
7
5
0
W
,
2
2
0
V
. Calculate the (i) current flowing through it, and (ii) its resistance when in use.
Medium
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>
If two bulbs of
2
5
W
and
1
0
0
W
rated at
2
0
0
volts are connected in series across a
4
4
0
volts supply, then
Medium
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>
Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c.supply line. The power drawn by the combination in each case respectively will be
Medium
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>
An electric bulb is rated 220 volt and 100 watt, Power consumed by it when operated on 110 volt is :
Easy
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>
A
1
0
0
W
,
2
0
0
V
bulb is connected to a
1
6
0
V
supply. The actual power consumption would be
Medium
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>
Write relation between heat energy produced in a conductor when a potential difference
V
is applied across its terminals and a current
I
flows through it for time
t
.?
Medium
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>
A domestic electric circuit has a fuse of
5
A
. What is the maximum number of
1
0
0
W
(
2
2
0
V
)
bulbs that can be safely used in the circuit?
Medium
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>