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प्रश्न
SI unit of resistance is:
पर्याय
mho
joule
ohm
ohm meter
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उत्तर
ohm
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संबंधित प्रश्न
A low voltage supply from which one needs high currents must have very low internal resistance. Why?
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.
The graph between V and I for a conductor is a straight line passing through the origin.
Which law is illustrated by such a graph?
What is the necessary condition for a conductor to obey Ohm’s law?
Calculate the electric field in a copper wire of cross-sectional area 2.0 mm2 carrying a current of 1 A.
The resistivity of copper = 1.7 × 10–8 Ω m
State microscopic form of Ohm’s law.
State macroscopic form of Ohm’s law.
Define temperature coefficient of resistance.
The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.
The circuit depicted in the figure is employed for studying Ohm’s Law. Instead of using a standard resistor, a student opts for a glass tube filled with mercury (tube 1), connected to the circuit through two electrodes, E1 and E2. He records the readings of the ammeter and voltmeter, thereby calculating the resistance. The student repeats the experiment by substituting tube 1 with tube 2, where the same amount of mercury fills tube 2.
Neglecting internal resistance of the cell use (> or < or =) to compare:
- the resistance in both the cases.
- the voltmeter readings in both the cases.
- the specific resistance in both the cases.
