Question

Draw a circuit diagram to verify Ohm's law.

Answer 1

Circuit diagram:

Explanation:

1. Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.
2. Mathematically, it can be represented as $V=IR$, where $V$=potential difference between two points, $I$=current passing through the conductor and $R$=resistance of the conductor.
3. The above circuit helps verify ohm's law. Voltmeter V, is connected in parallel with the resistor to measure potential difference. The ammeter A, connected in series helps measure current. The rheostat can be adjusted to vary the resistance. B represents the battery and K is the switch.
4. Voltmeter is a device of high resistance and is used to measure the potential difference across a component. It is connected in parallel so that it doesn't draw any current from the circuit, and does not affect the overall resistance.
5. Ammeter is a device of low resistance. It is connected in series so that the same current passing through the circuit passes through it as well.
6. On varying the rheostat value, different values of $V$ and $I$ can be noted. By plotting them, the trend can be observed and the validity of the statement can be checked.