EASY

10th CBSE

IMPORTANT

Earn 100

An electric motor takes $5 amperes$ current from a $220 volt$ supply line. Calculate the power of the motor and electrical energy consumed by it in $2 hours$ .

Important Questions on Electricity

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 22

Which uses more energy: a

250 W

TV Set in

1 hour

or a $1200 W$ toaster in

10 minutes

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 23

Calculate the power used in the $2 Ω$ resistor in each of the following circuits:
(i) a

6 V

battery in series with $1 Ω$ and $2 Ω$ resistors.
(ii) a

4 V

battery in parallel with $12 Ω$ and $2 Ω$ resistors.

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 24

Two lamps, one rated $40 W$ at $220 V$ and the other $60 W$ at $220 V$ , are connected in parallel to the electric supply at $220 V$ .
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one

hour

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 25

An electric kettle connected to the $230 V$ mains supply draws a current of $10 A$ . Calculate:
(a) the power of the kettle.
(b) the energy transferred in

1 minute

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 26

A $2 kW$ heater, a $200 W$ TV and three $100 W$ lamps are all switched on from

6 pm to 10 pm

. What is the total cost at

₨ 5.50

per

kWh

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 27

What is the maximum power in

kilowatts

of the appliance that can be connected safely to a $13 A, 230 V$ mains socket?

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 28

An electric fan runs from the $230 V$ mains. The current flowing through it is $0.4 A$ . At what rate is electrical energy transferred by the fan?

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Long Answer Type Questions>Q 29

(a) What is meant by "electric power"? Write the formula for electric power in terms of potential difference and current.
(b) The diagram below shows a circuit containing a lamp

L

, a voltmeter and an ammeter. The voltmeter reading is $3 V$ , and the ammeter reading is

0.5 A

.

(i) What is the resistance of the lamp?
(ii) What is the power of the lamp?
(c) Define

kilowatt - hour

. How many

joules

are there in one

kilowatt - hour

?
(d) Calculate the cost of operating a heater of $500 W$ for

20 hours

at the rate of

₹ 3.90 p e r unit

An electric motor takes 5 amperes current from a 220 volt supply line. Calculate the power of the motor and electrical energy consumed by it in 2 hours.

Important Questions on Electricity

Learn and Prepare for any exam you want !

An electric motor takes $5 amperes$ current from a $220 volt$ supply line. Calculate the power of the motor and electrical energy consumed by it in $2 hours$ .