Practical Verification of Ohm’s Law Using Ammeter and Voltmeter in a DC Circuit
This is an Experiment to demonstrate the functioning of an ammeter and a voltmeter in a DC circuit and to validate Ohm’s Law.
In this setup, a 0 to 30V regulated DC power supply provides a stable voltage for the experiment. The positive terminal of the power supply is connected to the positive terminal of an ammeter, which measures the current flowing through the circuit. The negative terminal of the ammeter is then connected to one end of a 1 kΩ resistor, while the other end of the resistor is connected to the negative terminal of the power supply, thus completing the circuit loop. Additionally, a voltmeter is connected across the resistor to measure the voltage drop across it. This arrangement ensures that the ammeter is in series with the resistor, capturing the total current, while the voltmeter reads the potential difference across the resistor.
Using Ohm’s Law,
𝑉=𝐼𝑅
V=IR, you can calculate the theoretical current by dividing the voltage across the resistor (as shown on the voltmeter) by the resistor’s value (1 kΩ). Comparing this calculated value with the current displayed on the ammeter provides a practical demonstration of Ohm's Law. This experiment serves as a practical application to understand how ammeters and voltmeters are connected in a circuit and validates the theoretical relationship between voltage, current, and resistance.