Apparatus for managing energy supplies; devices for measuring energy; devices for switching over energy tariffs; energy control devices; energy regulators; optical energy transfer apparatus; solar energy collectors for electricity generation; solar energy operating apparatus; thermal energy measuring apparatus; apparatus for protecting computers from electrical power supply faults; apparatus for the control of power supply to electrically driven motors; consumer type power supplies; digital control apparatus for power units; electric mains power units; electric power analysers; electric power converters; electric power line detectors; electric power storage apparatus; electric power supplies for electronic apparatus; electric power supply sockets; electric power supply units; electric power supply units having stabilised output voltage; electric power units; electric switches for electronic power control; electrical apparatus for the distribution of electric power; electrical line filters for use with electrical power packs; portable electric sockets (power boards); portable power supply apparatus (batteries); power analysers; power capacitors; power cells (electric); power conditioners; power conditioning apparatus; power controllers (electric); power controlling apparatus (electric); power distribution apparatus for use in electrical systems; power dividers (electric); power meters; power modules; power regulating apparatus; power relays; power sources (batteries); power supplies for computers; power supply apparatus (batteries); power supply devices (batteries); power system meters; power testers; power units (batteries); radio-frequency power meters