Question

Describe an experiment to verify ohms law

Answer 1

Answer:

Explanation

(a) State Ohm's law.

(b) Describe an experiment to verify this law.

Easy

(a)The potential difference across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same. This is called Ohm’s law.

(b) Experiment to verify Ohm's law:

Set up a circuit as shown in figure shown, consisting of a nichrome wire XY of length, say 0.5m, an ammeter, a voltmeter and four cells of 1.5V each. First use only one cell as the source in the circuit. Note the reading in the ammeter I, for the current and reading of the voltmeter V for the potential difference across the nichrome wire XY in the circuit. Tabulate them in a table. Next connect two cells in the circuit and note the respective readings of the ammeter and voltmeter for the values of current through the nichrome wire and potential difference across the nichrome wire. Repeat the above steps using three cells and then four cells in the circuit separately. Calculate the ratio of V to I for each pair of potential difference V and current I. In this experiment, we will find that approximately the same value for

I

V

is obtained in each case. Thus the V–I graph is a straight line that passes through the origin of the graph, as shown in the figure. Thus, V/I is a constant ratio, which verifies Ohm's law.

solution

Answer 2

Verification of Ohm's Law: A Simple Experiment

Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points.

To verify Ohm's law experimentally materials needed

1. A DC power supply
2. A resistor
3. A voltmeter
4. An ammeter
5. Connecting wires
6. Breadboard or circuit board

Experiment process:

• Connect the DC power supply to the breadboard or circuit board.
• Connect the resistor to the breadboard or circuit board in series with the ammeter.
• Connect the voltmeter in parallel with the resistor.
• Turn the power supply and adjust the desired voltage.
• Record the voltage and current readings from the voltmeter and ammeter respectively.
• Repeat steps 4 and 5 for several different voltage values.
• Plot a graph of voltage and the current, with voltage on the x-axis and current on the y-axis.
• If the graph forms a straight line passing through the origin, then Ohm's law is verified.
• Calculate the slope of the line, which represents the resistance of the resistor.
• Compare the calculated resistance value with the resistance value of the resistor as stated by the manufacturer to ensure accuracy.

It is important to note that the experiment should be performed using a resistor of a known resistance value to ensure accurate results. Additionally, the circuit should be constructed carefully to minimize errors due to loose connections or other factors.

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