Ans: The maximum current carrying capability of a resistor is known as its power rating. It is usually expressed in terms of watts because P = I^2.R.
2Q: What is meant by stability of a resistor?
Ans: The ability of a resistor of maintaining its ohmic value stable under variable physical conditions is termed as stability.
3Q: What is meant by reliability?
Ans: The ability of a resistor of maintaining a stable ohmic value for a long time while in use is called its reliability.
4Q: What is a wire wound resistor?
Ans: A resistor made by winding a wire on an insulated former is called a wire wound resistor.
5Q: What are the merits of a wire wound resistor as compared to a carbon resistor?
Ans: (1) It has a higher order of stability and reliability.
(2) It has a higher power rating with a low tolerance value.
(3) It is easy to make a wire wound resistor of 0.01 ohm even.
6Q: What are the demerits of a wire wound resistor as compared to a carbon resistor?
Ans: (1) It is difficult to make a wire wound resistor of several mega ohms.
(2) It is difficult to construct a variable type wire wound resistor and working of such resistor is not satisfactory.
(3) It is unsuitable for high frequency circuits.
(4) It has a big size which is unsuitable for many purposes.
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