Recreational Vehicle (RV) Technician Practice Test

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What is the amperage draw in a 12V series circuit that has four 3 ohm resistors?

0.5 A
1 A
1.5 A
2 A

The correct answer is: 1 A

To find the amperage draw in a 12V series circuit with four 3 ohm resistors, you first need to determine the total resistance in the circuit. In a series circuit, the total resistance is the sum of the individual resistances. So, you take the resistance of each resistor (3 ohms) and multiply it by the total number of resistors (4). This gives you: Total Resistance (R) = 3 ohms + 3 ohms + 3 ohms + 3 ohms = 12 ohms. Now, using Ohm’s Law, which states that voltage (V) equals current (I) times resistance (R) [V = I × R], you can rearrange this to find the current: I = V / R. Here, the voltage (V) is 12 volts, and the total resistance (R) is 12 ohms. Plugging these values into the equation gives: I = 12V / 12Ω = 1 A. This calculation indicates that the correct choice for the amperage draw in this circuit is indeed 1 A. Understanding these principles of series circuits and Ohm's Law is fundamental in the study and application of