i) Potential difference : voltmeter; then current ................
ii) Hydro power plant : Conventional source of energy; then solar energy: .....................

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Solution

A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. An ammeter is a measuring device used to measure the electric current in a circuit.
Energy obtainable from water flow or water falling from a higher potential to lower potential, is known is hydro- power. It is a conventional and renewable form of energy which can be transmitted to long distance through cables and wires.
Energy obtained from sun is known as Solar energy. It is non-conventional, renewable and inexpensive energy source.

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Q. Fill in the blanks.

a) Potential difference : voltmeter
then current : _______________
b) Hydro Power Plant : Conventional source of energy
then solar energy : ______________

Give examples :

(a) Non-conventional sources of energy.

(b) Fuels.

(d) Renewable source of energy.

(e) Never-ending source of energy.

(f) Machines that work on solar energy.

Electricity generated by water stored in hydro power plant is an inderect source of solar energy. Justify the statemnent by discussing in sequence the series of energy transformation taking place.

Q. In a hydro power plant, potential energy of water is finally converted into:

A source of potential difference V volt sends current I ampere in a circuit for time t second. Write expressions for

(a) electrical energy supplied by the source, and

(b) electrical power spent by the source.

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i) Potential difference : voltmeter; then current ................ii) Hydro power plant : Conventional source of energy; then solar energy: .....................

i) Potential difference : voltmeter; then current ................
ii) Hydro power plant : Conventional source of energy; then solar energy: .....................