Question

write an experiment to prove ohm's law​

Answer 1

Answer:

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.

Explanation:

Answer 2

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Amount of current flowing is proportional to potential difference /voltage under fixed physical condition.

vαI

V=IR

R=

I

V

Experiment to verify Ohm's Law

Aim : To show that the ratio of

I

V

is a constant for a conductor.

Materials required: 5 dry cells of 1.5V each, conducting wires, an ammeter, a voltmeter, thin iron spoke of length 10cm, LED and key

Procedure :

Connect a circuit as shown in the figure.

Solder the conducting wires to the ends of the iron spoke and close the key.

Note the reading of ammeter (current) and voltmeter (potential difference) and tabulate them.

Now connect two cells in the circuit and note the respective readings of ammeter and voltmeter in the above table.

Repeat the above procedure using three cells, four cells, and five cells respectively.

Record the values of potential difference, V and current, I corresponding to each case in the above table.

Find

I

V

for each set of values.

We notice that

I

V

is constant.

From this we can conclude that potential difference between the ends of the iron spoke is directly proportional to the current passing through it. This is ohm’s law. V/I.

From this we can conclude that P.D difference between the ends of the iron spoke is directly propotionala to the current passing tr=hrough it. This is Ohm's law.