Question

Correct set up to verify Ohm?s law is :

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is A

Ohm's law is a fundamental principle in electronics and electrical engineering that relates the current flowing through a conductor to the voltage across it and its resistance. Mathematically, it is expressed as:

V = I \times R,

where:

• V is the voltage across the conductor in volts (V).
• I is the current flowing through the conductor in amperes (A).
• R is the resistance of the conductor in ohms (Ω).

To verify Ohm's law, a simple experimental setup is used where a known resistance is connected in series with an ammeter and a variable voltage source. The voltmeter is connected across the resistor to measure the potential difference.

The correct setup to verify Ohm's law is shown in the image below. Here, the ammeter is connected in series with the resistor to measure the current, and the voltmeter is connected in parallel across the resistor to measure the voltage:

This setup ensures that the measurements are accurate and consistent with the requirements of Ohm's law:

• The ammeter measures the total current flowing through the circuit.
• The voltmeter measures the voltage specifically across the resistor.

By varying the voltage using the variable voltage source and recording the corresponding current, a V vs. I graph can be plotted. According to Ohm's law, this graph should be a straight line, indicating a direct proportionality between voltage and current, confirming the linear relationship V = I \times R.