When measuring volts, what quantity is being measured?

When measuring volts, what quantity is being measured?

• A. Electrical current
• B. Electrical resistance
• C. Electrical power
• D. Electrical pressure or force

Answer: (D)

Voltage is the electrical pressure that pushes charges, i.e., the potential difference between two points in a circuit. When you measure volts, you’re determining how much energy per unit charge is available to move charges from one point to another. In practical terms, a voltmeter reads the potential difference across a component or across two points. This isn’t the same as electrical current, which is the flow of charges (measured in amperes); nor the electrical resistance, which is how strongly a material opposes that flow (measured in ohms); nor electrical power, which is energy per unit time (measured in watts). A helpful analogy is water pressure: voltage is like the pressure difference that pushes water, while current is the flow rate and resistance is akin to the pipe’s friction or width.

Voltage is the electrical pressure that pushes charges, i.e., the potential difference between two points in a circuit. When you measure volts, you’re determining how much energy per unit charge is available to move charges from one point to another. In practical terms, a voltmeter reads the potential difference across a component or across two points.

This isn’t the same as electrical current, which is the flow of charges (measured in amperes); nor the electrical resistance, which is how strongly a material opposes that flow (measured in ohms); nor electrical power, which is energy per unit time (measured in watts). A helpful analogy is water pressure: voltage is like the pressure difference that pushes water, while current is the flow rate and resistance is akin to the pipe’s friction or width.