The discussion centers on calculating current in an electrical circuit using Ohm's Law. A potential difference of 20 volts across a 5-ohm resistor results in a current of 4 amperes, as derived from the formula I = V/R. The initial calculation mistakenly presented volts divided by ohms as volts, highlighting the importance of using correct units. The correct interpretation emphasizes that the SI unit for current is amperes (A).
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