EASY
10th CBSE
IMPORTANT
Earn 100

(a) Write down the formula for the heat produced when a current I is passed through a resistor R for time t.
(b) An electric iron of resistance 20 ohms draws a current of  5 amperes. Calculate the heat produced in 30 seconds.

Important Questions on Electricity

EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 11
State three factors on which the heat produced by an electric current depends. How does it depend on these factors?
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 12
(a) State and explain Joule's law of heating.
(b) A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 13
Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 14
Explain why, tungsten is used for making the filaments of electric bulbs.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 15
Explain why, the current that makes the heater element very hot, only slightly warms the connecting wires leading to the heater.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 16
When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88×104 J of heat is produced. Calculate:
(a) the power of the resistor.
(b) the voltage across the resistor.
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 17
A heating coil has a resistance of 200 Ω. At what rate will heat be produced in it when a current of 2.5 A flows through it? 
EASY
10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Short Answer Type Questions>Q 18
An electric heater of resistance 8 Ω takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater.