explain ohms law and its verification?
Ohm’s law state : – At constant temperature, the current flowing through a conductor is directly proportional to the potential difference across its ends.
Where R is constant for the given conductor at a given temperature and called resistance. Resistance is the property of conductor which resists the flow of electric current through it.
Activity : –
(1) Set up an electric circuit which is consisting of a nichrome wire XY of length 0.5m, an ammeter, a voltmeter and four cells of 1.5 V each as in fig.
(2) First we connect on cell in circuit and note down the reading of ammeter A for current and voltmeter V for potential differences across the nichrome wire XY.
(3) Now, connect two, three and four cells in the circuit one by one and note down the reading of ammeter and voltmeter in each case.
(4) Plot a graph b/w I and V observation: V – I graph is a straight line passing through the origin.
Result : – V is directly proportional to I. Verified