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Why can no machine or device convert all the energy available to it into useful work?
Wiki User
∙ 11y ago
Not quite true ... I give you the electric heater.
All the power in comes out as heat.
The problem with everything else is that there is always losses due to friction and/or hysteresis that becomes heat - lost heat because it is not the desired output.
Wiki User
∙ 11y ago
Wiki User
∙ 10y agoElectricity for domestic use has to be at a high voltage, for transmission over long distance. This reduces losses.
Closer to the point of use, it is reduced to safer low voltage, for domestic use.
Modern electronics use DC at even lower voltage. It would not be practical to send this low voltage at any distance. The power required would need very large, expensive cables and cause voltage drops, at any more than a few tens of metres distance.
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