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प्रश्न
State Ohm’s law.
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उत्तर
Ohm’s law states that electric potential difference across two points in an electrical circuit is directly proportional to the current passing through it. That is,
V~I
The proportionality constant is tne resistance (R) offered between the two points.
Hence, Ohm’s law is written as,
V = RI (or) V = IR
Where, V is the potential difference in volt (V), I is the current flow in ampere (A), R is the resistance in ohm (Ω)
संबंधित प्रश्न
A battery of emf 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively joined in series.
Find:
- Current in the circuit.
- The terminal voltage of the cell.
- The potential difference across 6Ω Resistor.
- Electrical energy spent per minute in the 4Ω resistor.
What is the unit of electric charge?
Name a device that help to measure the potential difference across a conductor.
Name the law which relates the current in a conductor to the potential difference across its ends.
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What current will be taken by a 920 W appliance if the supply voltage is 230 V?
State the S.I. unit of electric potential.
Calculate the potential difference between the two terminals of a battery if 100 joules of work is required to transfer 20 coulombs of charge from one terminal of the battery to the other.
What would you suggest to a student if while performing an experiment he finds that the pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when the circuit is open? No extra ammeter/voltmeter is available in the laboratory.
Find the resistance of a conductor if the electric current flowing through it is 0.35 A when the potential difference across it is 1.4 V.
Five resistors of different resistances are connected together as shown in the figure. A 12 V battery is connected to the arrangement.
Calculate:
(i) the total resistance in the circuit
(ii) the total current flowing in the circuit.
In the figure given below, A, B and C are three ammeters. The ammeter B reads 0.5A. (All the ammeters have negligible resistance.)
Calculate:
(i) the readings in the ammeters A and C.
(ii) the total resistance of the circuit.
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If P and V are the power and potential of device, the power consumed with a supply potential V1 is:
Find out the following in the electric circuit given in Figure
- Effective resistance of two 8 Ω resistors in the combination
- Current flowing through 4 Ω resistor
- Potential difference across 4 Ω resistance
- Power dissipated in 4 Ω resistor
- Difference in ammeter readings, if any.
The SI unit of potential difference is ______.
Name the instrument which is used to measure the potential difference.
______ is work done per unit charge.
