Using Ohm’s law, state three expressions for the electrical power that is dissipated in a resistor

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. The law is named after the German physicist Georg Ohm, who, in a treatise published in 1827, described measurements of applied voltage and current through simple electrical circuits containing various lengths of wire.

From Ohm's law, we can derive three expressions for the electrical power (P) dissipated in a resistor:

1. P = I^2 * R: This expression states that the power is equal to the current (I) squared times the resistance (R). This is useful when you know the current through and the resistance of the resistor.

2. P = V^2 / R: This expression states that the power is equal to the voltage (V) squared divided by the resistance. This is useful when you know the voltage across and the resistance of the resistor.

3. P = V * I: This expression states that the power is equal to the voltage times the current. This is useful when you know both the voltage across and the current through the resistor.