A switchboard ammeter indicates a reading...

Question 1 / 270705eccefa3bacbc34ba4d47f9d

Question 1 of 270705eccefa3bacbc34ba4d47f9d

A switchboard ammeter indicates a reading slightly above 'zero' when the leads are disconnected. What is this caused by?

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Question 1 of 27070

A switchboard ammeter indicates a reading slightly above 'zero' when the leads are disconnected. What is this caused by?

🔍 Key Concepts

• Analog ammeter construction (moving coil, pointer, mechanical zero adjustment) • Difference between electrical causes (grounding, charge, capacitance) vs purely mechanical causes • Behavior of a meter when leads are open-circuited (no current path)

💭 Think About

• If the leads are disconnected, is there any complete circuit for current to flow through the meter? What does that suggest about electrical vs mechanical causes? • Which of the options would still be present and have an effect even if there were absolutely no voltage or current applied to the meter? • Think about how the meter pointer is initially set to zero at the factory or during calibration. Which answer choice relates directly to that process?

✅ Before You Answer

• Verify which option would affect the pointer even with no electrical connection at all • Eliminate options that require current flow or stored electrical energy when the leads are open • Focus on the cause that is inherent to the meter movement and pointer rather than external electrical conditions

Question 1 of 27070

A switchboard ammeter indicates a reading slightly above 'zero' when the leads are disconnected. What is this caused by?

mechanical misalignment of the meter pointer

a poor ground for the meter case

static electricity in the air

capacitors inside the meter storing charges

Question 1 / 270705eccefa3bacbc34ba4d47f9d

Question 1 of 270705eccefa3bacbc34ba4d47f9d

A switchboard ammeter indicates a reading slightly above 'zero' when the leads are disconnected. What is this caused by?

Back

Question 1 of 27070

A switchboard ammeter indicates a reading slightly above 'zero' when the leads are disconnected. What is this caused by?