Verification of Ohms Law.
Verification of Ohms Law
Ohm's Law:
Ohm's Law states that the current passing through a conductor is directly proportional to the potential difference between its ends, provided the physical conditions such as temperature of conductor remain unchanged.
Experimental Verification Of Ohm's Law:
Set up a circuit as shown in figure below with a battery (B) to act as a source of electricity, a switch or a key (K) to control the flow of current in the circuit, a rheostat (Rh),to vary the resistance in the circuit, an ammeter (A) to measure the flow of current,, a resistor (R) across which a voltmeter (V) is connected to measure the potential difference. When ever the sliding terminal of the rheostat is moved the current in the circuit changes. We will follow the steps .given below to verify the Ohm's Law.
The graph of the current against the potential difference is plotted, it will be a straight line. This shows that the current is proportional to the potential difference.
Limitation of Ohm s Law
1. Ohm s law does not apply to conductors such as diode, radio valves, metal rectifiers, electricity through gases.
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