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[[File:Mains plug travel adaptor.jpg|right|thumb|This [[mains power plug]] travel adapter allows British plugs to be connected to American or A ...f an otherwise incompatible device or system. Some modify [[Electric power|power]] or [[Signal processing|signal]] attributes, while others merely adapt the ...

...so used to refer to extensions for other types of cabling. If the plug and power outlet are of different types, the term "adapter cord" may be used. Most e ...ious colors, lengths, thicknesses and service duties. In general, the more power needed by the appliance, the thicker the cord needs to be (meaning larger [ ...

...tor]]s of SELV circuits should be designed such that they do not mate with connectors commonly used for non-SELV circuits. ...[[Appliance classes|Class III]] [[battery charger]], fed from a Class II [[power supply]]. Modern cordless hand tools are considered SELV equipment. ...

...even though in reality the oscillator consumes even more energy from a DC power supply, which we have chosen to ignore. Under that restriction, we define t ...ce does. Nevertheless, it is an ''active'' component, since it relies on a power source to operate.</ref> Active components include amplifying components su ...

{{broader|Mains electricity}} ...available. For example, in North America, a unique [[Split-phase electric power|split-phase]] system is used to supply to most premises that works by cente ...

...enum vaporizer is an elegant device which works reliably, without external power, for many hundreds of hours of continuous use, and requires very little mai ...s required after switching on. The desflurane vaporizer will fail if mains power is lost. Alarms sound if the vaporizer is nearly empty. An electronic displ ...

| The decimal multiplier (number of trailing zeroes, or power of 10 multiplier) ...be marked with a five band system, to include three significant digits, a power of 10 multiplier (number of trailing zeroes, and a tolerance band. An extra ...

...similar hazards.<ref>{{cite web |title=Surge Protection in Low-Voltage AC Power Circuits - An Anthology Part 8 - Coordination of Cascaded Surge-Protective ...to 30 microseconds, that may reach over 1,000 volts. Lightning that hits a power line can give many thousands, sometimes 100,000 or more volts. A motor when ...

Progress in batteries, electric motors and power electronics have made electric cars more feasible than during the 20th cent ...ilt the first crude but viable electric motor; the next year he used it to power a small model car.<ref name=Guarnieri>{{Cite book|last=Guarnieri|first=M.|t ...