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प्रश्न
Define ampere and volt with respect to Ohm’s law.
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उत्तर
Ampere: It is the S.I. unit of current. If a current flows in a conductor of resistance of 1Ω, when the potential difference across its ends is 1 volt, the current is said to be 1 ampere, i.e.,
1 ampere = 1 volt/1 ohm
Volt: It is the S. I. unit of potential difference. If a current of 1 ampere flows in a conductor of resistance 1 ohm, then potential difference across its ends is said to be 1 volt, i.e.,
1 volt = 1 ampere × 1 ohm.
संबंधित प्रश्न
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
Find the expression for the resistivity of a material and state the SI unit of resistivity.
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
How should the two resistances of 2 ohms each be connected so as to produce an equivalent resistance of 1 ohm?
How much energy is consumed when a current of 5 amperes flows through the filament (or element) of a heater having resistance of 100 ohms for two hours? Express it in joules.
An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of filament of bulb while glowing.
Define Current density.
The temperature of a conductor is increased. The graph best showing the variation of its resistance is:
Why should an ammeter have low resistance?
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.
