In electrical notation, which quantity is denoted by the letter E?

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Voltage is what E represents in electrical notation—the electromotive force the source provides to push charges around a circuit. This potential difference is what drives current, and in many teaching contexts E is used for emf, a form of voltage generated by a source. The other quantities are described by different symbols: current by I, resistance by R, and power by P. So E corresponds to voltage because it denotes the source’s potential difference that causes current to flow.