A DC source of EMF E volts and internal resistance R ohms is connected to a variable load and it is adjusted such that the load absorbs maximum power from the source. The current drawn from the source is:
1
\(\rm \frac{2E}{R}\)
2
\(\rm \frac{E}{R}\)
3
\(\rm \frac{4E}{R}\)
4
\(\rm \frac{E}{2R}\)