When required to drill holes on a roof that has no power supply the best drill for the job would be a cordless drill.
It should be noted that a power supply is an electrical device which supplies electric power to an electrical load.
In this case, the main purpose of a power supply is simply to be able to convert electric current from the source to the correct current, and frequency.
In this case, the power supply unit converts the main AC to a low-voltage regulated DC power. Therefore, When required to drill holes on a roof that has no power supply the best drill for the job would be a cordless drill.
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