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The rate at which energy is delivered by a current is the of the appliance.

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Important Questions on Current Electricity

EASY
Physical Science>Physics>Current Electricity>Electrical Power
Commercial unit of electrical energy one kilowatt hr. (1 kWh) is equivalent to:
EASY
Physical Science>Physics>Current Electricity>Electrical Power

An electric bulb is connected to a 240 V generator. The current is 0.65 A. What is the power of the bulb?

MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power

Soham uses a 600 W Music System for 5 hours daily. Calculate the electrical energy consumed in kWH for 30 days.

MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
An electric heater is used on a 220 V supply and takes a current of 5 A. What is its power, and what is the cost of using the heater for one hour, if 1kWh costs 50 Paisa? 
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Physical Science>Physics>Current Electricity>Electrical Power
Which wire in a power circuit is connected to the metallic body of the appliance?
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Physical Science>Physics>Current Electricity>Electrical Power
Define electric power.
EASY
Physical Science>Physics>Current Electricity>Electrical Power
1 horse power (HP) is equal to:
EASY
Physical Science>Physics>Current Electricity>Electrical Power
An electric bulb is rated at 220 V-100 W. What will be its resistance?
MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
If a bulb of 60 W is connected across a source of 220 V, find the current drawn by it.
EASY
Physical Science>Physics>Current Electricity>Electrical Power
In the electric equipment producing heat e.g., iron, electric heater, boiler, toaster etc., an alloy such as Nichrome is used, not pure metals. Give Scientific reason.
MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
An 100 watt electric bulb is lighted for two hours daily and four 40 watt bulbs are lighted for 4 hours daily. Calculate the energy consumed in (kWh) in 30 days. 
EASY
Physical Science>Physics>Current Electricity>Electrical Power

The diagram below shows a dual control switch circuit connected to a bulb. Out of A & B which one is the live wire and which one is the neutral wire? 

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MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case?
HARD
Physical Science>Physics>Current Electricity>Electrical Power
There are 10 LED bulbs of 12 W each and 5 fans of 75 W each in a house. They are used for 10 hours per day. Prepare the bill for the month of February 2020 if the rate is Rs. 6 per unit. 
MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case?
EASY
Physical Science>Physics>Current Electricity>Electrical Power

What is the Power of a refrigerator, which is connected to a 220 V generator? The current is 1.25 A.

MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
An electric refrigerator rated 400 W and an electric bulb rated 100 W operates10  hours/day. What is the cost of the energy to operate it for 10 days at Rs 8.00 per kWh? 
MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
Two tungsten bulbs of power 50 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?
EASY
Physical Science>Physics>Current Electricity>Electrical Power
What characteristics should a fuse wire have?
MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
Why is fuse wire always placed in a live circuit?