Answer for USA, Canada and countries running a 60 Hz supply service.
A three wire installation provides a power source for independent 120 volt circuits and 240 volt circuit with neutral.
A common 120/240 volt 200 amp distribution service panel can have 42 circuits supplied from it. These circuits can be in any number of different combinations of 120 volts or 240 volts.
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the function of a power source in a circuit is that it provides a steady source of static electricity
Mains electricity is nothing but main source of power in an installation. From the mains the power is then branched out to different end usage.
Mains electricity is nothing but main source of power in an installation. From the mains the power is then branched out to different end usage.
Luminous efficacy is a figure of merit for light sources. It is the ratio of luminous flux (in lumens) to power (usually measured in watts). As most commonly used, it is the ratio of luminous flux emitted from a light source to the electric power consumed by the source, and thus describes how well the source provides visible light from a given amount of electricity.This is also referred to as luminous efficacy of a source.
voltage