Elevator Mechanic Practice Exam

There is voltage at the switch, but none at A, what is wrong?

1. Short at S1

2. Closed R1 circuit

3. Open at R2 or R1

4. Short at R2

The correct answer is: Open at R2 or R1

The correct answer indicates that there could be an open circuit in either the R2 or R1 component. When there is voltage present at the switch but not at point A, it suggests that the electrical path to A is incomplete, preventing current from reaching that point. This situation typically arises when one or more components in the circuit have an open connection, which breaks the flow of electricity. In this context, having an open at R2 or R1 means that either of these resistive components is not allowing current to pass through, therefore causing a lack of voltage at point A. This scenario emphasizes the importance of ensuring all parts of the circuit are functional for proper operation. Voltage at the switch indicates that the source is intact and functioning, but without a closed path through R1 or R2, the electrical current cannot flow to A. Therefore, identifying the open circuit condition in either of those components is crucial for troubleshooting the issue effectively.