What is Ohm's law and how is it used in shipboard circuits?

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Multiple Choice

What is Ohm's law and how is it used in shipboard circuits?

Ohm's law links voltage, current, and resistance with the simple equation: V = I × R. This means the voltage across a circuit element equals the current through it multiplied by its resistance. In shipboard circuits, this is the foundation for predicting how much current a circuit will draw, how much voltage will drop along wiring, and how to size conductors and fuses to keep systems safe and reliable. For example, if a feeder carries 8 A and the path has 3 Ω of resistance, the voltage drop is 8 × 3 = 24 V, so a 120 V supply would present about 96 V at the load. Conversely, with a 120 V supply and a load resistance of 24 Ω, the current is 120/24 = 5 A. In AC circuits, you use the same idea with impedance, but the core concept—voltage being the product of current and opposition to flow—remains the same.

Ohm's law links voltage, current, and resistance with the simple equation: V = I × R. This means the voltage across a circuit element equals the current through it multiplied by its resistance. In shipboard circuits, this is the foundation for predicting how much current a circuit will draw, how much voltage will drop along wiring, and how to size conductors and fuses to keep systems safe and reliable.

For example, if a feeder carries 8 A and the path has 3 Ω of resistance, the voltage drop is 8 × 3 = 24 V, so a 120 V supply would present about 96 V at the load. Conversely, with a 120 V supply and a load resistance of 24 Ω, the current is 120/24 = 5 A. In AC circuits, you use the same idea with impedance, but the core concept—voltage being the product of current and opposition to flow—remains the same.

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