Question

Experimental Verification of Ohm's Law ( Class : 10th ) { 5 Marks }

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Answer 1

Explanation:

Ohm's Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.

To students of electronics, Ohm's Law (E = IR) is as fundamentally important as Einstein's Relativity equation (E = mc²) is to physicists.

E = I x R

When spelled out, it means voltage = current x resistance, or volts = amps x ohms, or V = A x Ω.

Named for German physicist Georg Ohm (1789-1854), Ohm's Law addresses the key quantities at work in circuits:

Answer 2

Answer:

Material required :

A resistor of about 5 Ω, an ammeter ( 0 - 3 A), a voltmeter (0 - 10 V), four dry cells of 1.5 V each with a cell holder (or a battery eliminator), a plug key, connecting wires, and a piece of sand paper.

Precautions :

• All the electrical connections must be neat and tight.

• Voltmeter and Ammeter must be of proper range.

• The key should be inserted only while taking readings.

Procedure :

• Draw the circuit diagram as shown above.

• Arrange the apparatus as per the circuit diagram.

• Clean the ends of the connecting wires with sand paper and make them shiny.

• Make the connections as per circuit diagram. All connections must be neat and tight. Take care to connect the ammeter and voltmeter with their correct polarity. (+ve to +ve and -ve to -ve).

• Determine the zero error and least count of the ammeter and voltmeter and record them.

• Adjust the rheostat to pass a low current.

• Insert the key K and slide the rheostat contact to see whether the ammeter and voltmeter are showing deflections properly.

• Adjust the rheostat to get a small deflection in ammeter and voltmeter.

• Record the readings of the ammeter and voltmeter.

• Take atleast six sets of readings by adjusting the rheostat gradually.

Plot a graph with V along x-axis and I along y-axis.

The graph will be a straight line which verifies Ohm's law.

Determine the slope of the V-I graph. The reciprocal of the slope gives resistance of the wire.

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