closeup of toroidal core coil in electronic printed circuit board on black background

electronic coil capacitor circuit electrical component closeup inductor green pcb electromagnetic relay engineering power supply voltage converter macro black background blue choke transformer toroidal circle induction copper twisted wire spiral winding ferrite core magnetic field device spare resistor printed board design store energy electricity inverter electrotechnics electromechanics industry technology technical service repair inside ewaste disposal red white holder round material toroid ring inductance ferromagnetic switch element equipment network electric electrotechnology recycling blur components capacitors resistors