Physics
One should not connect a number of electrical appliances to the same power socket because

the appliance will not get full voltage
this can damage the domestic wiring due to overloading
this can damage the electrical meter
this can damage the appliances due to overloading

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Physics
The law of conservation of energy states that

Energy can neither be created nor destroyed
Energy can neither be created or destroyed
Energy can either be created nor destroyed
Energy can either be created or destroyed

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