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    • Lesson 1 Assessment
Heat & AC Load Simulator (Manual J)
Desktop/Tablet Interactive AC Dynamics Simulator
Mobile Interactive AC Dynamics Simulator

HVAC Calulators
  • R 454B Start Up/Commissioning Calculator

 

  • Refrigerant PT Calculator

 

  • CFM Estimate Calculator

 

  • Capacitor Under Load Calculator

 

  • R-22 Superheat Calculators

 

  • Clocking Gas Meter Calculator

 

  • Altitude Derate Calculator

 

  • Ohm’s Law + Power Law calculator

Diagnostic Training Logic Trees (Forced Air Furnaces)
  • Verify Control Voltage Logic

 

  • Bad Thermostat Diagnostics Tree (Non-Communicating)

 

  • Bad Inducer Motor Diagnostic Tree

Question 1

Question 1 Explained

Watch this explanation to understand which answer is correct and why the others are incorrect.

Question 1 - Second Attempt Explained

A. The motor has 4 amps of resistance.
Incorrect. Resistance is measured in ohms, not amps. Amps measure the amount of electrical current flowing through a circuit.

B. The motor is receiving 120 volts.
While this might be true, the meter is measuring amperage, not voltage. We cannot determine the voltage from a current measurement alone.

C. A certain amount of electrical charge (electrons) is passing through that wire every second.
Correct. Amperage tells us how much electrical charge (electrons) passes through a point in a wire every second. A reading of 4 amps tells us that electrical current is flowing at that rate through the wire, but it doesn't tell us the voltage, resistance, or whether the motor is operating properly.

D. The motor is operating normally because electrical current is flowing.
Incorrect. Current flow tells us electricity is moving through the circuit, but it does not tell us if it is the right amount for the motor to operate properly. We have to check the motor data plate to determine that.

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