Over-current protection in a power supply.
Over-current protection in a power supply.
PSU efficiency certification program.
Ratio of output power to input power.
Power supply with permanently attached cables.
Power supply with some fixed and some detachable cables.
Power supply with detachable output cables.
Power supply using linear voltage regulation.
Transformer used in flyback power-conversion circuits.
Everything is a system, and every system contains systerms.