Final answer:
Voltage is the amount of energy released by electrons as they travel through a circuit. It is responsible for driving the flow of electric current.
Step-by-step explanation:
The amount of energy released by electrons as they travel through a circuit is known as voltage. Voltage is defined as the electric potential difference between two points in a circuit, and it is responsible for driving the flow of electric current. In a direct current (DC) circuit, the voltage remains constant, while in an alternating current (AC) circuit, the voltage periodically reverses its direction.