Internet of Things (IoT) Practice Exam

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If a heater coil has a resistance of 10 Ohms and the input voltage is 120V, what is the current?

12 amps
1,200 amps
0.083 amps
10 amps

The correct answer is: 12 amps

To determine the current flowing through the heater coil, you can utilize Ohm's Law, which establishes a relationship between voltage (V), current (I), and resistance (R). The formula is I = V / R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms. In this scenario, the input voltage is 120 volts, and the resistance of the heater coil is 10 ohms. By substituting these values into the formula, we get: I = 120V / 10Ω = 12A. This calculation shows that the current flowing through the heater coil is 12 amps, which corresponds to the correct answer. Understanding this calculation is crucial in electrical applications within the Internet of Things context, as accurate current and resistance values are important for designing efficient systems.