Q6 of 33 Page 1

Name the electric device that converts mechanical energy into electrical energy. Draw the labelled diagram and explain the principle involved in this device.

Electric generator converts mechanical energy into electrical energy. It works on the principle of electromagnetic induction i.e. current can be induced in a coil by rotating it in a magnetic field.


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4

An object of height 1.2m is placed before a concave mirror of focal length 20cm so that a real image is formed at a distance of 60cm from it. Find the position of an object. What will be the height of the image formed?

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Why is there a need to harness non-conventional sources of energy? Give two main reasons.

 6

(i) What is the function of earth wire in electrical instruments?

(ii) Explain what is short-circuiting an electric supply.


(iii) What is the usual current rating of the fuse wire in the line to feed (a) Lights and fans? (b) Appliances of 2kW or more power?

 7

Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 4Ω in series with a combination of two resistors (8Ω each) in parallel and a voltmeter across parallel combination. Each of them dissipates maximum energy and can withstand a maximum power of 16W without melting. Find the maximum current that can flow through the three resistors.