is a specific kind of: electrical device.

is a broader term that covers: bridge, bridge circuit | bridged-T | closed circuit, loop | computer circuit | delay line | feedback circuit, feedback loop | flip-flop | clipper, limiter | data link, link | open circuit | pulse timing circuit | resonant circuit, resonator | series circuit | squelch, squelch circuit, squelcher | tank circuit | T-network | wiring ... show more.

has as a part: capacitance, capacitor, condenser, electrical condenser | choke, choke coil, choking coil | electrical relay, relay | resistance, resistor | short, short circuit | bypass, electrical shunt, shunt | electron tube, thermionic tube, thermionic vacuum tube, thermionic valve, tube, vacuum tube.

is a part of: electronic equipment.