Electricity Circuits and Their Components Class 7 Short Question Answer

Electricity Circuits and Their Components Class 7 Short Question Answer

Electricity Circuits and Their Components Class 7 Short Question Answer

Question 1.

What happens when the filament in a bulb breaks?

Answer:

The circuit becomes incomplete. The electric current stops flowing and the bulb stops glowing.

Question 2.

Why is a switch important in an electric circuit?

Answer:

It allows us to control the flow of current. We can turn a device on or off using a switch.

Question 3.

What is an electric cell and what are its terminals called?

Answer:

An electric cell is a portable source of electrical energy. It has two terminals-positive (+) (cathode) and negative (-) (anode). These terminals help establish the flow of electric current in a circuit.

Question 4.

What happens when current passes through the filament of an incandescent lamp?

Answer:

The filament of an incandescent lamp gets heated when electric current flows through it. As a result, it starts glowing and produces light. The filament is made of materials that can withstand high temperatures.

Question 5.

Why does an LED light up in one direction only?

Answer:

An LED allows electric current to pass in only one direction. It has a longer wire (positive) and a shorter one (negative). It lights up only if correctly connected to a battery's terminals.

Question 6.

Draw the symbols of the following:

(i) Electric cell

(ii) Battery

(iii) Electric lamp

(iv) Switch in 'ON' position

Answer: