What does E equal?

What does E equal?

• A. Current that flows in a circuit
• B. Resistance measured in ohms
• C. Power measured in watts
• D. Voltage difference between two points in a circuit, measured in volts

Answer: (D)

E represents the voltage difference, the electromotive force that drives charges from one point to another in a circuit. It’s the energy per unit charge provided by the source, measured in volts. This is why E is associated with the “push” behind current flow. It is not current (which is measured in amperes), not resistance (ohms), and not power (watts). In simple terms, E is the driving voltage; in real sources with internal resistance, the actual terminal voltage can be V = E minus the drop inside the source (I times internal resistance).

E represents the voltage difference, the electromotive force that drives charges from one point to another in a circuit. It’s the energy per unit charge provided by the source, measured in volts. This is why E is associated with the “push” behind current flow. It is not current (which is measured in amperes), not resistance (ohms), and not power (watts). In simple terms, E is the driving voltage; in real sources with internal resistance, the actual terminal voltage can be V = E minus the drop inside the source (I times internal resistance).