A low voltage supply from which one needs high currents must have very low internal resistance. Why?

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#### Solution

According to Ohm’s law, the relation for the potential is *V *=* IR*

Voltage (*V*) is directly proportional to current (*I*).

*R* is the internal resistance of the source.

`I=V/R`

If *V* is low, then *R* must be very low, so that high current can be drawn from the source.

Concept: Ohm’s Law

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