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प्रश्न
Name the physical quantity whose unit is "ohm".
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उत्तर
Electrical resistance is the physical quantity whose SI unit is ohm.
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संबंधित प्रश्न
What is Resistivity?
Write the formula of resistivity
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?
The resistors R1, R2, R3 and R4 in the figure given below are all equal in value.
What would you expect the voltmeter A, B and C to read assuming that the connecting wires in the circuit have negligible resistance?
State Ohm’s law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it.
What is the necessary condition for a conductor to obey Ohm’s law?
Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 V.
In the circuit shown below in Fig, calculate the value of x if the equivalent resistance between A and B is 4 Ω.
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
What is meant by the drift speed of free electrons?
What are non-ohmic conductors? Give one exmaple. Draw a current-voltage graph for a non-ohmic conductor.
Define Current density.
Which of the following I-V graph represents ohmic conductors?
Which of the following is correct for V-I graph of a good conductor?
A current of 2amp flowing through a conductor produced 80 joule of heat in 10 sec. The resistance of the conductor is:-
The heat produced by a 100 w heater in 2 minute is equal to
What is the resistance of a conductor through which a current of 0.5 A flows when a potential difference of 2V is applied across its ends?
A current of 0.8 A flows in a conductor of 40 Ω for 1 minute. The heat produced in the conductor will be ______.
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.
