Residential Air Conditioning Systems Mechanic (313D) Certification Practice Exam

The primary effect of a motor during startup in an air conditioning system is that it causes a voltage drop and draws high amperage. This phenomenon occurs because, at startup, electric motors require a significant amount of current in order to overcome inertia and initiate movement. This is known as inrush current, which can be several times greater than the motor's running current.

As the motor starts, the sudden increase in current draw can lead to a temporary voltage drop in the electrical supply. This voltage drop can impact other devices connected to the same electrical circuit, potentially causing dimming lights or affecting other equipment operation.

Understanding this behavior is crucial for technicians, as they must account for these high startup currents when sizing electrical components and ensuring that the system functions properly without causing circuit interruptions.

While the other options may represent different aspects of motor operation or system function, they do not accurately depict the immediate impact an air conditioning system’s motor has during the startup phase.