Airstreams Gate 4 Practice Test

If the resistance decreases while connected to a fixed voltage source, what happens to current?

The total current increases The total current decreases The total current remains the same The total current varies unpredictably

Correct Answer:

The total current increases

Explanation:

With a fixed voltage, current follows Ohm’s law: I = V/R. If the resistance decreases while the voltage stays the same, the denominator gets smaller and the current increases. For example, at 12 volts, dropping resistance from 6 ohms to 3 ohms makes the current go from 2 A to 4 A. The same voltage pushes more charge per second when there’s less opposition. In real circuits, a power source may have some internal resistance and might not maintain the exact voltage under heavy load, but the basic idea is that lowering resistance at a constant voltage increases current.

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