question_answer

State Ohm's law. Draw a labelled circuit diagram to verify this law in the laboratory. If you draw a graph between the potential difference and current flowing through a metallic conductor, what kind of curve will you get? Explain how would you use this graph to determine the resistance of the conductor.

Answer:

Ohm?s law states that the electric current flowing through a conductor is directly proportional to the potential difference across its two ends other physical conditions like temperature main constant.

\[V\propto \,\,I\]

or                     \[\frac{V}{I}=\text{Constant}=R\]

or                     \[V=IR\]

Thus, the ratio \[V:I\] is a constant. This constant. This constant called the resistance \[(R)\] of the conductor.

Circuit diagram for Ohm?s law:

Graph:

Explanation: If a graph is drawn between the potential difference (V) and current (I), the graph is found to be a straight line passing through the origin.  This shows that the current is directly proportional to the potential difference. Thus, the ratio \[\frac{V}{I}\] remains constant. This constant is called the resistance of the conductor. The gradient of the straight line graph is related to the resistance (R) of the conductor