What is voltage?

What is voltage?

• A. Electrical pressure in a circuit
• B. The speed of electrons
• C. The resistance of a circuit
• D. The current in a circuit

Answer: (A)

Voltage is the electrical pressure that pushes charges to move through a circuit. It’s the potential difference between two points, created by a source such as a battery, which raises the energy of charges on one side and drives them toward the other. Measured in volts, voltage acts as the driving force that, together with the circuit’s resistance, determines how much current flows. Think of it like water pressure in a pipe: higher pressure pushes more water through, just as higher voltage pushes more electric charge through a conductor. The current is the rate at which charges flow, and resistance is how hard it is for them to move. Ohm’s law ties them together with V = I × R, so increasing voltage (with resistance constant) increases current, while higher resistance reduces current. But voltage isn’t the speed of electrons—that’s the drift speed of the charge carriers, which is a different concept. It also isn’t the resistance, nor the actual current itself.

Voltage is the electrical pressure that pushes charges to move through a circuit. It’s the potential difference between two points, created by a source such as a battery, which raises the energy of charges on one side and drives them toward the other. Measured in volts, voltage acts as the driving force that, together with the circuit’s resistance, determines how much current flows.

Think of it like water pressure in a pipe: higher pressure pushes more water through, just as higher voltage pushes more electric charge through a conductor. The current is the rate at which charges flow, and resistance is how hard it is for them to move. Ohm’s law ties them together with V = I × R, so increasing voltage (with resistance constant) increases current, while higher resistance reduces current.

But voltage isn’t the speed of electrons—that’s the drift speed of the charge carriers, which is a different concept. It also isn’t the resistance, nor the actual current itself.