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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
Graph showing the variation of current versus voltage for a material Ga As is shown in the figure. Identify the region of
(i) negative resistance
(ii) where Ohm's law is obeyed.
A low voltage supply from which one needs high currents must have very low internal resistance. Why?
What is an Ohmic resistor?
Write the formula of resistivity
Name the unit of electrical resistance and give its symbol.
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?
How should the two resistances of 2 ohms each be connected so as to produce an equivalent resistance of 1 ohm?
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?
What is the necessary condition for a conductor to obey Ohm’s law?
Which of the following is an ohmic resistance?
Calculate the effective resistance across AB?
State the limitations of Ohm’s law.
Choose the correct alternative.
Which of the following is an ohmic conductor?
Write a short note on superconductors?
Explain the equivalent resistance of a series resistor network.
The slope of voltage (V) versus current (I) is called:
Assertion: The statement of Ohm’s law is K = IR.
Reason: V = IR is the equation which defines resistance.
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?
The voltage - current readings of a certain material are shown in the table given below:
| Voltage (V) | 10 V | 20 V | 30 V |
| Current (I) | 2 A | 3 A | 4 A |
Study the table.
- State whether the conductor used is ohmic or non-ohmic.
- Justify your answer.
- State Ohm's law.
A current of 3.2 mA flows through a conductor. If charge on an electron is −1.6 × 10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.
