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Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

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Op-amps, their impedance and current flow

Ideally, an opamp has an infinite input impedance (and thus zero input current) and an infinite open loop gain , along with infinite output voltage range, bandwidth and slew rate and zero impedance at … limited to input voltage. …
Andrei Biu's user avatar