CBSE PHYSICS
Electricity Practice Questions for CBSE
1. Define electric potential difference?
2. Why is an ammeter connected in series in a circuit?
3. Why is a voltmeter connected in parallel in a circuit?
4. State the law that governs the strength of the current passing through a metallic conductor when a p.d is applied across its end. Illustrate this law graphically?
5. State the law which governs the amount of heat produced in a metallic conductor when current is passed through it for a given time. Express this law mathematically?
6. Define resistance. What are the factors on which it depends?
7. A copper wire of resitivity P is stretched to reduce its diameter to half its previous value. What is the new resistivity?
8. Define the S I unit of electric current and potential difference.
9. Derive expressions for equivalent resistance of resistors connected in
a. series combination
10. What is an electric fuse? Explain its function.
11. Explain, how the heating effect of electric current is made use in the functioning of an electric bulb?
12. State the relation between the commercial and SI unit of electric energy.
13. Write the advantages of connecting electrical appliances in parallel and disadvantages of connecting them in series in a household circuit.
14. Why is tungsten used almost exclusively for making the filaments of electric lamps?
15. A piece of wire is redrawn by pulling it until its length is doubled .Compare the new resistance with the original value.
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