Which of the following is essential for calculating electrical resistance?

The essential elements for calculating electrical resistance are current and voltage, which is derived from Ohm's Law. Ohm's Law states that resistance (R) is equal to voltage (V) divided by current (I), or R = V/I. This relationship implies that if you know the voltage across a component and the current flowing through it, you can easily compute the resistance the component offers to the flow of electricity.

In electrical circuits, resistance is the property that opposes the flow of electric current, and understanding it is crucial for designing and analyzing circuits. The other options involve different electrical properties that do not directly pertain to the fundamental calculation of resistance. While voltage and power, current and frequency, or power and inductance may be involved in various aspects of electrical theory and applications, they are not specifically used together to directly calculate resistance as current and voltage are.