TOPIC : Electric Current and its effects
Q.1. Name the device which helps in breaking or completing a circuit?
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Q.2. Who observed the magnetic effect of current for the first time?
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Q.3. What is the glowing part of a bulb called?
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Q.4. When is the bulb said to be fused?
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Q.5. Draw the neat labelled diagram of an electric bell.
Q.6. What do you understand by the 'heating effect of current'? State 3 factors on which the amount of heat produced depend?
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Q.7. What is an electric fuse? How does it work?
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Q.8. What is an electromagnet? State any two factors that determine the strength of an electromagnet?
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Q.9. Raj made an electric circuit & placed a magnetic compass near it.
(a) On switching on, the needle of the magnetic compass showed a deflection Why?
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(b) On switching off, the needle came back to its normal north-south direction. Why?
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Q.10. Draw a circuit diagram, using symbols, showing a bulb, a closed switch & a battery of four cells. Also show the direction of current flowing through the circuit.
Please click on below link to download CBSE Class 7 Science Electric Current And Its Effects Worksheet Set C