While troubleshooting a circuit in an engine...

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Question 1 of 2066636eed28f7522a1c51dc92

While troubleshooting a circuit in an engine room central control console, a resistor is suspected of being faulty. Which of the following precautions must be observed if an analog or digital multimeter set up as an ohmmeter is to be used to check its value?

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Question 1 of 20

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🔍 Key Concepts

• Ohmmeter operation – how a multimeter measures resistance using its internal battery • Why a component must be isolated from the rest of the circuit to get an accurate resistance reading • The danger of having a circuit energized when using the ohms function

💭 Think About

• Ask yourself: what happens inside the meter when it is set to measure resistance, and why would applied circuit voltage be a problem? • Consider whether current from other parts of the circuit could flow through the resistor and affect your reading if it is left connected. • Think about when polarity truly matters in resistance measurements and for which types of components (e.g., diodes vs. simple resistors).

✅ Before You Answer

• Verify whether an ohmmeter should ever be connected to a live (energized) circuit. • Check if the suspected resistor is still electrically connected to parallel or series paths that could change its apparent resistance. • Confirm whether a fixed resistor (not a diode, transistor, or polarized component) requires any particular polarity for resistance measurement.

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