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Based on the given circuit configuration, determine the correct calculation related to the ammeter reading.

1. The resistance of the ammeter is calculated as 480 × 20 / (480 + 20) = 19.2Ω.
2. The combined resistance R is equal to 40.8 + 19.2 = 60Ω.
3. The current measured by the ammeter is determined using i = V / R.
4. The electromotive force (E) of the circuit is 30V.

Correct answer: The current measured by the ammeter is determined using i = V / R.

Solution

The correct step in the given options is the calculation of current using Ohm's Law, i = V / R, which is option C. The other steps involve resistance calculations and voltage, but option C directly applies the formula correctly.

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