A circuit has a 28-volt supply and a total resistance of 20 ohms. The total current flow is

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Enhance your understanding of the fundamentals of electricity with the AMT General Exam. Study with multiple-choice questions crafted to improve your knowledge and confidence. Prepare effectively for your success!

Multiple Choice

A circuit has a 28-volt supply and a total resistance of 20 ohms. The total current flow is

Explanation:
Current is determined by Ohm’s law: I = V / R. With a 28-volt supply and 20 ohms of resistance, the current is I = 28 / 20 = 1.4 amperes. This means about 1.4 coulombs of charge flow per second through the circuit under those conditions. The other currents would require different total resistances (for example, 0.8 A would need 35 Ω, 0.2 A would need 140 Ω, and 2.0 A would need 14 Ω), which doesn’t match the given 20 Ω.

Current is determined by Ohm’s law: I = V / R. With a 28-volt supply and 20 ohms of resistance, the current is I = 28 / 20 = 1.4 amperes. This means about 1.4 coulombs of charge flow per second through the circuit under those conditions. The other currents would require different total resistances (for example, 0.8 A would need 35 Ω, 0.2 A would need 140 Ω, and 2.0 A would need 14 Ω), which doesn’t match the given 20 Ω.

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