Chapter 12 Part 2 Flashcards
Thicker wires that can carry more current safely then thinner wires
Conductor
Amount of power used when one amp or flows with one potential difference of 1 Volt
Electrical power
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
Voltage
Component in an electronic system that is considered neither an insulator nor a conductor, but a partial conductor
Semiconductor
A force, causing a magnetic field to attract ferrous metals, or where like poles of a magnet repel, and unlike poles attract each other
Magnetism
An induced voltage producing a resistance in an alternating current circuit
Inductance
Device that produces voltage in a second circuit through electromagnetic induction
Transformer
Instrument that measures voltage, current and resistance, and on some models temperature
Multimeter
Device in an electric circuit, that stores, electrical energy for later use
capacitor
A relationship among the voltage, current and resistance and power in a electrical circuit
Ohms law
Unit of current flow
Ampere
One time use device used to protect circuits from overloading an overheating
Fuse
T/F
Resistance in a circuit can be checked when the circuit is energized
False
T/F
A diode in an electrical circuit is used to control current flow in one direction.
True
T/F
A Positive Temperature Coefficient (PTC) thermistor causes the resistance of the thermistor to increase as temperature increases.
True
T/F
18 AWG is larger in diameter than 10 AWG.
False
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.
True
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.
True
T/F
DC current can be created from alternating current (AC) power sources by utilizing
solid-state or electronic circuits referred to as rectifiers.
True
T/F
In an inductive circuit, current leads voltage.
False
T/F
The HVAC technician should not select the size of the conductor nor install the wire unless licensed to do so.
True
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.
True
Meter probes placed on point L1 and point 9 will have an expected meter reading of ___ V.
115V
A meter reading of 0V when probes placed at points 3 and 9 indicates the service switch is in what position?
Open
When does the fan switch close?
Closes with the rise in temperature because switch is a thermistor
Is the meter reading incorrect? Explain
Yes its incorrect (Didnt get the explanation from Mo)
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.
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:
