If resistor R3 is disconnected at terminal D, what will the ohmmeter read?

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Enhance your understanding of the fundamentals of electricity with the AMT General Exam. Study with multiple-choice questions crafted to improve your knowledge and confidence. Prepare effectively for your success!

Multiple Choice

If resistor R3 is disconnected at terminal D, what will the ohmmeter read?

Explanation:
Resistance measurements with an ohmmeter rely on a closed path for current between the test leads. If R3 is disconnected at terminal D, the path through that branch is opened, so no current can flow. The ohmmeter then reports an infinite resistance, i.e., an open circuit. Values like 0 ohms would only occur if there were a short between the leads, which isn’t the case here; finite values like 10 or 20 ohms require a conducting path through some resistors, which is absent when the branch is open.

Resistance measurements with an ohmmeter rely on a closed path for current between the test leads. If R3 is disconnected at terminal D, the path through that branch is opened, so no current can flow. The ohmmeter then reports an infinite resistance, i.e., an open circuit. Values like 0 ohms would only occur if there were a short between the leads, which isn’t the case here; finite values like 10 or 20 ohms require a conducting path through some resistors, which is absent when the branch is open.

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