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प्रश्न
उत्तर
The obstruction offered to the flow of current by the wire is called its electrical resistance. It is a kind of friction between the free electrons and the atoms of the conductor along which they flow.
Its SI unit is 'ohm'.
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संबंधित प्रश्न
Complete the following :-
(a)
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
Find the expression for resistors connected in series.
Give one example to show how the resistance depends on the nature of material of the conductor.
Give the law of combination of resistances in series.
Calculate the equivalent resistance of the following combination of resistor r1, r2, r3, and r4
State expression for Resistance connected in series.
State a relation between electrical power, resistance and potential difference in an electrical circuit.
The resistance of the hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamps, when not in use?
