Recreational Vehicle (RV) Technician Practice Test

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Prepare for the Recreational Vehicle (RV) Technician Test. Utilize interactive quizzes and in-depth questions with explanations. Get ready to become certified!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is the resistance of a 120 volt, 1200 watt electric heater?

6 ohms
10 ohms
12 ohms
15 ohms

The correct answer is: 12 ohms

To determine the resistance of the electric heater, we can use the formula that relates power (P), voltage (V), and resistance (R) in an electrical circuit. The formula for power is given by: \[ P = \frac{V^2}{R} \] Rearranging this formula to solve for resistance gives: \[ R = \frac{V^2}{P} \] In this case, the voltage (V) is 120 volts and the power (P) is 1200 watts. Plugging these values into the rearranged formula: \[ R = \frac{(120)^2}{1200} \] Calculating this, we get: \[ R = \frac{14400}{1200} = 12 \text{ ohms} \] This calculation shows that the resistance of the heater is indeed 12 ohms. The correct answer is confirmed as 12 ohms, aligning with standard electrical principles regarding power, voltage, and resistance.