Class 7 Electric Current and Its effects Important Questions VBQs

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Activity 1

Aim: To observe the heating effect of current

Materials required: Battery eliminator, wires, heating element

Theory: When electric current flows through a wire, the wire becomes hot. This is called heating effect of current.

Diagram:

Procedure: 1. Connect the heating element with the battery eliminator using wires as shown in the circuit diagram.

2. Let the current flow through the wire and observe.

Observation:

Conclusion:

ELECTRIC CURRENT AND ITS EFFECTS

Activity 2

Aim: To observe the magnetic effect of current Materials required: Battery eliminator, wires, a solenoid, magnetic compass, alpins

Theory: When electric current flows through a wire, the wire behaves like a magnet. This is called magnetic effect of current.

Diagram:

Procedure: 1. Connect the solenoid with the battery eliminator using wires as shown in the circuit diagram.
2. Let the current flow through the wire .
3. Bring a magnetic compass near it and observe.
4. Keep some alpins near the solenoid / wire and observe.

Observation:

Conclusion:

CONSTRUCTION AND WORKING OF ELECTRIC BELL

Construction: - An electric bell consists of a coil of wire wound on an iron piece. This coil acts as an _____________________. An iron strip with a hammer at one end is kept close to the electromagnet.
There is a contact screw near the iron strip. A gong is placed near the hammer. The circuit is made as shown in the diagram.
Working: - When the _________________ is completed, current flows through the coils of the ______________________. It attracts the ____________________ that is attached to the hammer. The hammer moves with it and hits the __________, but the circuit is now _______________ at the point X of the contact screw. The electromagnet loses its ___________________ and no longer attracts the iron strip (soft iron armature). The ____________________ moves back to its original position and makes contact at X, thus completing the _________________ again. This cycle is then repeated as long as the switch is on.


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