Current Electricity (Part=2) Ohm's Law and Resistance
Ohm's Law is there any relation between current and potential difference? Let us perform an experiment for this. Activity Connect one meter long nichrome wire to a variable power supply as shown in Fig.(8.6). Also connect an ammeter in series with the circuit. Connect a voltmeter parallel to the nichrome wire. Increase the voltage step by from the power supply. Keep on noting the Fig. 8.6 reading V of voltmeter and the reading I of ammeter. You will observe that the value V-I remains constant i.e.,V is proportional to I. The relation between potential difference and current, first discovered by George Simon Ohm in 1826is that The current flowing through a conductor is directly proportional to the potential difference provided that the temperature and the physical state of the conductor does not chang...