Class 7 Electric Current and Its effects Important Questions VBQs

Class 7 Electric Current and Its effects Important Questions VBQs. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

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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