Chapter 4: Electrical Measurement & Testing Equipment Flashcards Preview

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Flashcards in Chapter 4: Electrical Measurement & Testing Equipment Deck (31)
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1

Voltage tester

Indicates whether voltage is present in a circuit

2

Digital voltage tester

Used indicator lights or a digital readout to report the amount of voltage present. Draws little current from the circuit.

3

Solenoid voltage tester

Uses a higher amount of current to activate the tester’s solenoid, which indicates the presence of voltage.

4

What are two small and inexpensive voltage testers?

Circuit tester and noncontact voltage tester

5

Circuit tester

Has two interchangeable probes and a small light indicating voltage.

6

Noncontact voltage tester

Can detect voltage through wire insulation or by having its tip pushed partway into a receptacle slot

7

Receptacle tester

Plugs into a standard-voltage (120V) receptacle. Tells you whether the receptacle is wired properly and is grounded or if it has a wiring problem.

8

Some receptacle testers can be used with ________ to identify the receptacle’s circuit.

Wireless circuit breaker tester units.

9

VOM

Volt-ohm-milliammeter

10

Multimeter

Tests for multiple electrical properties, including voltage, current, resistance, and continuity.

11

Before using a multimeter you must know the _____ and the approximate ____ and _____ of the circuit or device.

Type of current (ac or dc); voltage; current

12

Using a handheld meter in a _________ may damage the meter and possibly cause an injury.

High-voltage circuit

13

Clamp meter

Tests current through insulation by hooking around the wire or cable. May be used in a residential setting to test service wires.

14

Maximum testing capability of voltage testers and multimeters

240 V and 10 A

15

Maximum testing capability for clamp meters

1,000 A and 1,000+ V

16

Insulation tester

Tests the resistance of insulation: whether it is good enough to safely handle the current flowing through the wiring.

17

How does an insulation tester work?

It applies a preset level of dc voltage and a relatively small amount of current through wiring and checks for losses that can indicate leakage through the insulation.

18

What are three other names for an insulation tester?

Insulation resistance tester; megohmmeter; meggie.

19

Earth ground tester

Checks the earth’s resistance to dissipating energy around a ground system.

20

Soil and its contents- including rock, moisture, and impurities- can vary widely in ________________.

How well it accepts electrical energy.

21

Soil with ________ provides a less effective ground than soil with ________.

Higher resistance; low resistance.

22

The resistance of soil can change with ____ and _______ changes.

Time; temperature.

23

The testing method most commonly used for a single residential ground rod is called ________. This tests a ground rod’s ability to __________.

Fall-of-potential; dissipate energy at its current location.

24

During new construction, an electrician may conduct a _________ test to determine a suitable location for installing a new ground rod.

Soil resistivity

25

Phase and motor rotation testers

Used by maintenance electricians to determine motor rotation direction and to check the phase sequence of a motor’s power supply wires.

26

A tester’s _________ must be higher than those of any equipment the tester will be used on.

Voltage and amperage ratings

27

What symbol indicates a tool is double-insulated?

A small square inside of a larger square

28

Proper polarity is important when testing ______ and _______ but not ______ or ________.

Voltage and current; continuity or resistance

29

The red probe on a tester is ______ and connects to the _______ wire

Positive; hot

30

The black probe on a tester is _______ and connects to the ______ wire.

Negative; neutral