Knowing the Voltage,V

◆Voltage is a measure of the energy carried by the charge. Strictly: voltage is the "energy per unit charge".
◆The proper name for voltage is potential difference or p.d. for short, but this term is rarely used in electronics.
◆Voltage is supplied by the battery (or power supply).
◆Voltage is used up in components, but not in wires.
◆We say voltage across a component.
◆Voltage is measured in volts, V.
◆Voltage is measured with a voltmeter, connected in parallel.
◆The symbol V is used for voltage in equations.

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