A1 LT9 Flashcards

1
Q

What precautions should be taken when using electrical measuring instruments?

A

Do not use resistance-measuring device on a live circuit

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2
Q

How should you select the meter range for a reading?

A

Top two-thirds of the scale

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3
Q

What should you not exceed when using a coil with an ohmmeter?

A

Current rating.

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4
Q

What type of scale is used when there are equal spaces between each division?

A

Linear scale

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5
Q

Why is it important to read the meter while looking straight at the pointer?

A

Accuracy

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6
Q

What should you do when finished with a meter?

A

Switch it off

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7
Q

What should you not exceed when using an ohmmeter?

A

Power rating of the meter.

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8
Q

What is the error introduced when looking at the meter from off to either side?

A

Parallax error

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9
Q

What should you switch a meter to if there is no OFF switch position?

A

Highest possible range

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10
Q

What should you switch a multimeter to for AC voltage measurements?

A

Highest possible AC voltage range

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11
Q

Why is it difficult to visually identify issues in an electric circuit?

A

Electricity cannot be seen

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12
Q

What should you avoid when using galvanometer-based meter movements?

A

Avoid placing near other magnetic fields

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13
Q

What are meters used for in relation to electricity?

A

Measure effects of electricity

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14
Q

What can happen if a stray magnetic field affects the instrument?

A

Inaccurate responses or damage

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15
Q

Why should you take great care with electrical meters?

A

Precision instruments, easily damaged

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16
Q

What type of meter should be used based on whether you are working with DC or AC?

A

Match the meter to the supply

17
Q

Why are moving coil instruments particularly susceptible to vibration and sudden impact?

A

Delicate parts

18
Q

What can happen if the meter is not used in the proper position?

A

Inaccurate readings

19
Q

What should you do every time you change scales on an ohmmeter?

A

Zero the meter again

20
Q

Why should you use the built-in holding device when transporting or storing the meter?

A

To retain moving parts

21
Q

What are voltmeters used to measure?

A

Potential difference

22
Q

How are some meters constructed to protect against parallax error?

A

With a small mirror just below the scale markings

23
Q

Why is it important to test the voltmeter on a known source before and after using it?

A

To prevent faulty readings

24
Q

Why is it crucial to make sure the voltmeter is on the appropriate range setting?

A

To ensure accurate readings

25
What is the purpose of performing meter readings in electricity?
Verify circuit concepts
26
Why should the current be OFF when using a resistance-measuring device?
To avoid damaging the ohmmeter
27
Why should an ammeter never be connected in parallel?
Forms a short circuit
28
Why is it important to observe the meter polarity when connecting it into the circuit?
To avoid damaging the meter
29
What must you observe when using an ohmmeter?
Never use on live circuits.