EASY
10th CBSE
IMPORTANT
Earn 100

A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends?

Important Questions on Electricity

EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Very Short Answer Type Questions>Q 11
A current of 5 amperes flows through a wire whose ends are at a potential difference of 3 volts. Calculate the resistance of the wire.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Very Short Answer Type Questions>Q 12
Ohm's law states a relation between potential difference and _____ (Electric power/ Electric current/ Electric energy).
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 13
Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistors and two insulators.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 14
Classify the following into good conductors, resistors and insulators:
Rubber, Mercury, Nichrome, Polythene, Aluminium, Wood, Manganin, Bakelite, Iron, Paper, Thermocol, Metal coin
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 15
What is Ohm’s law? Explain how it is used to define the unit of resistance.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 16
(a) What is meant by the “resistance of a conductor”? Write the relation between resistance, potential difference and current.
(b) When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 17
(a) Define the unit of resistance.
(b) What happens to the resistance as the conductor is made thinner?
(c) Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 18
(a) Why do electricians wear rubber hand gloves while working with electricity?

(b) What p.d. is needed to send a current of 6 A through an electrical appliance having a resistance of 40 Ω?