State Ohm’s law? How can it be verified experimentally? Does ithold good under all conditions? Comment

Ohm's Law states that the current passing through a conductor between two points is directly proportional to the voltage across the two points. It is represented by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance.

To verify Ohm's Law experimentally, you can follow these steps:

1. Set up a simple circuit with a power source, a resistor, an ammeter, and a voltmeter. The ammeter should be in series with the resistor, and the voltmeter should be in parallel.
2. Turn on the power source and record the current (I) from the ammeter and the voltage (V) from the voltmeter.
3. Change the resistance in the circuit using a variable resistor or by changing the resistor itself. Record the new current and voltage.
4. Repeat step 3 for a variety of resistances.
5. Plot a graph of voltage (V) against current (I). If Ohm's Law is correct, the graph should be a straight line passing through the origin.

Ohm's Law does not hold under all conditions. It is an empirical law that holds for many materials under many conditions, but there are exceptions. For example, it does not hold for semiconductors, which have a non-linear I-V characteristic. It also does not hold at very high frequencies or very high voltages, where the resistance can change due to various effects.