In Ohm's Law, what does the letter E represent?

In Ohm's Law, the letter E represents voltage. Ohm's Law is a fundamental principle in electrical engineering that relates voltage (E), current (I), and resistance (R) in an electrical circuit. The law is commonly expressed in the formula E = I × R, which shows how voltage is dependent on the current flowing through a conductor and the resistance of that conductor.

Voltage can be thought of as the electrical potential difference that drives the current through a circuit. It is the force that pushes electrical charges to move, and when a circuit is completed, this movement of charges constitutes current flow. Therefore, understanding that E denotes voltage is crucial for operating and analyzing electrical circuits safely and effectively.

The other options represent different fundamental electrical concepts: current (I) refers to the flow of electric charge, resistance (R) is a measure of how much a material opposes the flow of current, and power (P) is the rate at which energy is consumed or converted, calculated in terms of voltage and current. Recognizing these definitions helps to reinforce the significance of voltage in the context of Ohm's Law and broader electrical applications.