First-Year HVAC Service Certification Practice Test

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If a circuit has a resistance of 14 ohms and is supplied with 240v, what is the amp draw?

10 amps

12.5 amps

17.14 amps

To determine the amp draw in a circuit, you can use Ohm's Law, which states that the current (I) in amperes is equal to the voltage (V) in volts divided by the resistance (R) in ohms. This can be expressed with the formula:

I = V / R

In this case, the circuit has a voltage of 240 volts and a resistance of 14 ohms. Plugging these values into the formula gives:

I = 240V / 14Ω

Calculating this:

I = 17.14 amps

Therefore, the correct answer is the one that reflects this calculation. The amp draw is 17.14 amps, which aligns with the provided answer choice. Understanding this concept is essential in HVAC work, as calculating the current draw helps ensure that circuits are not overloaded and operate safely.

20 amps