MEDIUM
7th CBSE
IMPORTANT
Earn 100

In electromagnet, what is the advantage of the iron core?

Important Questions on Electric Currents and Circuits

MEDIUM
7th CBSE
IMPORTANT
New Science Ahead>Chapter 14 - Electric Currents and Circuits>Exercises>Q 1
Draw a diagram of a circuit that can be used to light an electric bulb, using a battery of three cells as the power source and a switch.
EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 14 - Electric Currents and Circuits>Exercises>Q 2
Why is a fuse wire necessary in a circuit? How does it work?
MEDIUM
7th CBSE
IMPORTANT
New Science Ahead>Chapter 14 - Electric Currents and Circuits>Exercises>Q 3
Draw the structure of an electric bulb and describe how it works.
MEDIUM
7th CBSE
IMPORTANT
New Science Ahead>Chapter 14 - Electric Currents and Circuits>Exercises>Q 4
What is a solenoid? Outline an experiment to demonstrate the magnetic effect of a solenoid.
HARD
7th CBSE
IMPORTANT
New Science Ahead>Chapter 14 - Electric Currents and Circuits>Exercises>Q 5
With the help of a diagram, explain the working of an electric bell.
MEDIUM
7th CBSE
IMPORTANT
New Science Ahead>Chapter 14 - Electric Currents and Circuits>Exercises>Q 1
An electromagnet is made by winding an insulated copper wire on an iron cylinder. Why should the copper wire be insulated?
MEDIUM
7th CBSE
IMPORTANT
New Science Ahead>Chapter 14 - Electric Currents and Circuits>Exercises>Q 2
What do you think will happen if a thick copper wire is used as a fuse?
MEDIUM
7th CBSE
IMPORTANT
New Science Ahead>Chapter 14 - Electric Currents and Circuits>Exercises>Q 3
In domestic wiring, what is the advantage if every appliance has its own fuse?