EASY
7th CBSE
IMPORTANT
Earn 100

What are the ways to change the strength of an electromagnet?

Important Questions on Electric Current and its Effects

MEDIUM
7th CBSE
IMPORTANT
WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 3 - Electric Current and its Effects>EVALUATE>Q 3
In what ways, a solenoid is different from an electromagnet?  
MEDIUM
7th CBSE
IMPORTANT
WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 3 - Electric Current and its Effects>EVALUATE>Q 4

Compare the given diagrams. Write any 2 similarities and 2 dissimilarities between the given diagrams.

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EASY
7th CBSE
IMPORTANT
WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 3 - Electric Current and its Effects>EVALUATE>Q 5
Write any two necessary conditions for an electric current to flow in the circuit.
MEDIUM
7th CBSE
IMPORTANT
WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 3 - Electric Current and its Effects>EVALUATE>Q 1
Explain the working of an electric bell with help of a diagram.
MEDIUM
7th CBSE
IMPORTANT
WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 3 - Electric Current and its Effects>EVALUATE>Q 2
Where is the earth wire connected in an electrical appliance? How does earth wire prevent electric shocks? 
MEDIUM
7th CBSE
IMPORTANT
WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 3 - Electric Current and its Effects>EVALUATE>Q 3
Draw a well-labelled diagram of a closed electric circuit.
MEDIUM
7th CBSE
IMPORTANT
WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 3 - Electric Current and its Effects>EVALUATE>Q 4

How does an electric current flow in a closed circuit? Explain.

EASY
7th CBSE
IMPORTANT
WOW! SCIENCE Hands-on Learning in SCIENCE 7>Chapter 3 - Electric Current and its Effects>EVALUATE>Q 1

An electric oven of 3 kW is connected to the mains of 220 V. Calculate:

The amount of energy consumed if the oven is switched on for an hour.