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) shown on the ammeter and the voltage (V) shown on the voltmeter.
3. Change the resistance in the circuit, either by using a different resistor or by adjusting a variable resistor.
4. Again, record the current (I) and voltage (V).
5. Repeat these steps for a range of resistances.
6. Plot a graph of current (I) against voltage (V). 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 apply to semiconductors, which have a non-linear I-V characteristic. It also does not apply at very high frequencies or very high voltages, where the resistance can change due to various effects. Furthermore, it does not apply if the temperature of the conductor changes, as this can also change the resistance.