Electric Power
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- Main sub-station
- City sub-station
- Grid sub-station
- Electric pole
A bulb of resistance 1 ohm is connected across a battery of 10 V. Find the power consumed.
0.01W
100W
0.1 W
10 W
If 100 J is the energy required for an appliance to run per second, then what is the power consumed by it in watts, if it operates at 220V?
22000 W
22 W
100 W
Data insufficient
- P=V2R
- VI=P2
- P=Iv
- V=P2I
Mathematical expression for electric power(P), where I is current and R is resistance, is;
- P=IR
- P=IR
- P=RI
- P=I2R
Power is defined as work done per unit
- volume
- area
- time
- length
Which unit among the following can represents electric power?
None of these
J
W
VA
When a bulb of resistance 1 Ω is connected across a battery, it draws a constant power of 400 W. What is the total power drawn when 4 such bulbs are connected in series across the same battery?
50W
100W
25W
0.25W
An electric bulb is rated 220 V and 100 W. When it is operated at 110 V, the power consumed will be
- 100 W
- 75 W
- 50 W
- 25 W
The current through a 10 V tungsten filament lamp connected to a 10 V source of negligible resistance is 2 A. Calculate the electrical energy (in kWh) consumed in 5 hours.
0.2 kWh
100 kWh
0.1 kWh
20 kWh