21. Nichrome wire is an alloy of
22. Resistance of 220 V, 100 W lamp will be
23. The S.I. unit of power is
24. A thermistor has
25. All of the following are equivalent to watt except
26. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes
27. Bulbs in street lighting are all connected in
28. An electric filament bulb can be worked from
29. With rise in temperature the resistance of semiconductors
30. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is
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