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Glossary

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Term Description
I/O Input/output, as in I/O port. See: Port.
Impedance Similar to resistance, an impedance represents the total opposition to the flow of current offered by a circuit. Impedance equals the vector sum of resistance and reactance, which is the complex resistance resulting from inductance and capacitance, not just pure resistance. Measured in ohms, and given the symbol, Z.
Inrush Current A large charging current that flows into a capacitor or circuit when power is first applied.
Interposing Relay A relay that isolates the circuit driving it, and switches a higher current or voltage than the driving circuit could provide. See: Relay.
Inverter A logic device that complements the logic state of its input. See: Complement.
ISA Industry Standard Architecture. An 8-bit or 16-bit communication bus standard developed to provide expansion slots on motherboards of IBM compatible computers.
Isolation A condition that separates circuits so no current can flow between them. Special devices such as opto-couplers provide a signal path between two circuits, but without current flow between them.
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