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प्रश्न
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उत्तर
Variable resistors consist of a resistance track with connections at both ends and a wiper which moves along the track as you turn the spindle. The track may be made from carbon, cermet (ceramic and metal mixture), or a coil of wire (for low resistances). The track is usually rotary but straight track versions, usually called sliders, are also available.
Variable resistance is a device used to change the resistance and hence the current flowing through a circuit; without changing the voltage.
APPEARS IN
संबंधित प्रश्न
Name the physical quantity of which the unit is volt
On increasing the resistance in a circuit, the current in it :
What do you understand by the term quantity of electric charge?
What do you understand by the term electric current?
State the relation between electric current; the number of electrons moving in a circuit and time in seconds.
State three factors on which the resistance of a wire depends. Explain, how does the resistance depend on the factors stated by you.
