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प्रश्न
What is meant by resistance of a conductor ? Define its SI unit.
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उत्तर
Resistance is the quality of a conductor that causes it to resist the flow of an electric current through it. It is the proportion of the potential difference between ends to the current flowing. It has a Sl unit of ohm (Ω).
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संबंधित प्रश्न
Name the law which is illustrated by the above V−I graph.
Keeping the p.d. constant, the resistance of a circuit is halved. The current will become:
(a) one-fourth
(b) four time
(c) half
(d) double
A wire of resistance 9 ohm having length 30 cm is tripled on itself. What is its new resistance?
In the circuit shown in the figure, find the total resistance of the circuit and the current in the arm AD.
Define the following:
Coulomb
Rewrite the following statement by selecting the correct option.
The S.I. unit of resistance is __________.
What is ohmic device?
Explain the equivalent resistance of a parallel resistor network.
Which of the following is correct for V-I graph of a good conductor?
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.
