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प्रश्न
What is non-ohmic resistor?
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उत्तर
This is a resistor which does not obey Ohm’s Laws.
V -1 graph for a non-ohmic resistors is not a straight line.
संबंधित प्रश्न
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 should remain constant in a statement of this law?
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.
Calculate the effective resistance across AB?
Define the following:
Coulomb
A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case, power dissipation is P2. The ratio of `"P"_2/"P"_1` is
Define temperature coefficient of resistance.
What is meant by resistance of a conductor ? Define its SI unit.
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.
Which of the following correctly defines Potential Difference (V) as one of the three core quantities of Ohm's Law?
If the voltage across a conductor is increased while its temperature remains unchanged, what happens to the current flowing through it?
