Answer:
(a)
The potential difference between two points is 1 V means that if a charge of 1
coulomb is moved from one point to the other, 1 joule of work is required. (1)
The potential difference across a conductor is measured by means of an instrument
called the voltmeter. (1/2)
(b) The electric power {P) is given by
(1/2)
The resistance of the heating element is very high. Large
amount of heat generates in the heating element and it glows hot.
The resistance of connecting chord is very low.
Thus, negligible heat generates in the connecting cord and
it does not glow. (1)
(c) (i) Silver is a better conductor due to its lower resistivity.
(1)
(ii) Nichrome should be used in electrical heating devices
due to very high resistivity.(1)
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