General Aim of Measurement of Ohmic Resistances Using Ammeter and Voltmeter
- Verify the Ohm’s law.
- Determination of unknown resistance.
- Determination of total resistance of resistances connected in parallel and in series.
Measurement of Ohmic Resistances Using Ammeter and Voltmeter Method
General method using Ohmic resistance circuits.
Objectives: Measurement of Ohmic Resistances Using Ammeter and Voltmeter
Understand the relation between current and voltage in a circuit with Ohmic resistance.
state ohm's law and determine the equivalent resistance when many resistors are connected in series or in parallel.
Theory: Measurement of Ohmic Resistances Using Ammeter and Voltmeter
According to Ohm’s law, potential difference between two points of a resistor is directly proportional to the current flowing through this resistor at constant temperature. The proportionality constant is called resistance.
V = I R
When a number of resistances are connected on series, the total resistance will be:
But, If they are connected on parallel, their total resistance will be:
Measurement of Ohmic Resistances Using Ammeter and Voltmeter Principle of Work
In measurement of ohmic resistances using ammeter and voltmeter experiment, If we measure the potential differenceacross the resistor and current passing through it and plot a graph between them, a straight line passes through the origin is obtained whose slope is related to the resistance of the resistor. The same procedure is repeated to verify the series and parallel connection formulae for resistors.
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