Chapter 12 Part 2

Question 1

Thicker wires that can carry more current safely then thinner wires

Answer 1

Conductor

Question 2

Amount of power used when one amp or flows with one potential difference of 1 Volt

Answer 2

Electrical power

Question 3

when an electron surplus builds up on one side of a circuit and a shortage of electrons exists on the other side, the difference in potential is created

Answer 3

Voltage

Question 4

Component in an electronic system that is considered neither an insulator nor a conductor, but a partial conductor

Answer 4

Semiconductor

Question 5

A force, causing a magnetic field to attract ferrous metals, or where like poles of a magnet repel, and unlike poles attract each other

Answer 5

Magnetism

Question 6

An induced voltage producing a resistance in an alternating current circuit

Answer 6

Inductance

Question 7

Device that produces voltage in a second circuit through electromagnetic induction

Answer 7

Transformer

Question 8

Instrument that measures voltage, current and resistance, and on some models temperature

Answer 8

Multimeter

Question 9

Device in an electric circuit, that stores, electrical energy for later use

Answer 9

capacitor

Question 10

A relationship among the voltage, current and resistance and power in a electrical circuit

Answer 10

Ohms law

Question 11

Unit of current flow

Answer 11

Ampere

Question 12

One time use device used to protect circuits from overloading an overheating

Answer 12

Fuse

Question 13

T/F
Resistance in a circuit can be checked when the circuit is energized

Answer 13

False

Question 14

T/F
A diode in an electrical circuit is used to control current flow in one direction.

Answer 14

True

Question 15

T/F
A Positive Temperature Coefficient (PTC) thermistor causes the resistance of the thermistor to increase as temperature increases.

Answer 15

True

Question 16

T/F
18 AWG is larger in diameter than 10 AWG.

Answer 16

False

Question 17

T/F
Inductive loads primarily generate a magnetic field, unlike resistive loads such as
incandescent light bulbs and electric heaters that generate primarily light and/or heat.

Answer 17

True

Question 18

T/F
The unit used to measure the quantity of electrons moving past a given point in a
specific period of time is the ampere.

Answer 18

True

Question 19

T/F
DC current can be created from alternating current (AC) power sources by utilizing
solid-state or electronic circuits referred to as rectifiers.

Answer 19

True

Question 20

T/F
In an inductive circuit, current leads voltage.

Answer 20

False

Question 21

T/F
The HVAC technician should not select the size of the conductor nor install the wire unless licensed to do so.

Answer 21

True

Question 22

T/F
A ground fault circuit interrupter (GFCI) functions when it detects a difference
between the current flowing into a circuit and the current flowing back from the circuit.

Answer 22

True

Question 23

Meter probes placed on point L1 and point 9 will have an expected meter reading of ___ V.

Answer 23

115V

Question 24

A meter reading of 0V when probes placed at points 3 and 9 indicates the service switch is in what position?

Answer 24

Open

Question 25

When does the fan switch close?

Answer 25

Closes with the rise in temperature because switch is a thermistor

Question 26

Is the meter reading incorrect? Explain

Answer 26

Yes its incorrect (Didnt get the explanation from Mo)

Question 27

Four resistors are connected in parallel with a power supply of 117 volts. The resistors are rated at 200 h, 10K 0, 500 R and 15K R. Find everything.

Answer 27

Vt= 117V
Rt=139.5349 ohms
It = 0.8385 A
Pt = 98.104 W
Current in each branch:
Volts across each resistor:
Power for each resistor: