Describe an activity to find relationship between potential difference (V) across two ends of a conductor and current (I) flowing through it by including in your answer (i) the diagram of electric circuit (ii) V – I graph.
Answers
(v) First we connect the one cell to circuit and take the reading of ammeter A and voltmeter V for the potential differences across the wire. 3. Then connect the rest of the cells to the circuit and collect the readings of the ammeter and voltmeter respectively.
Explanation:
1. Set up an electric circuit consisting of a 0.5 m long nichrome wire xy, an ammeter, a voltmeter, and four cells of 1.5 V each.
2. First we connect the one cell to circuit and take the reading of ammeter A and voltmeter V for the potential differences across the wire.
3. Then connect the rest of the cells to the circuit and collect the readings of the ammeter and voltmeter respectively.
4. Plot the graph between V and I . The V-I graph is a straight line pssing through the origin.
Output: V is directly proportional to I.
Ohm's Law: At a constant temperature, the electrical current flowing through a fixed linear resistance is directly proportional to the voltage applied across it, and also inversely proportional to the resistance.
