Which quantity is measured by Volts?

• A. Current
• B. Electrical pressure
• C. Resistance
• D. Power

Answer: (B)

Voltage is the electrical pressure, or potential difference, in a circuit. It represents the push that causes electric charges to move through conductors. When there is a path and some resistance, this pressure drives current. Current is the actual flow of charges (measured in amperes), resistance is how much a component opposes that flow (measured in ohms), and power is the rate at which energy is transferred (measured in watts) and equals voltage times current. In practical terms, higher voltage means a stronger push, which can lead to more dangerous shock if a person completes a circuit.