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1 volt is equivalent to 1 joule per second (J/s).
A voltmeter must be connected in series to measure potential difference across a component.
Analogue voltmeters give a reading directly on a display.
In a series circuit, the potential difference across each component can be different.
A multimeter can measure current, voltage, and resistance.
A potential difference of 2.0 V across a component means 2.0 J of energy is transferred to thermal energy by every 1 C of charge.
The potential difference across a component is measured using an ammeter.
Potential difference is often referred to as voltage.
The battery in a circuit provides the potential difference needed to drive current through the circuit.
When current passes through a copper connecting wire, it transfers a large amount of energy to thermal energy.