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HVAC Level 1 > Electrical > Flashcards

Electrical Flashcards

1
Q

Resistive resistance is:

A

Resistance that remains constant.

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2
Q

Reactive resistance is:

A

Resistance found in devices with a magnetic coil, which creates a magnetic field in direct opposition to the volt, creating back-emf.

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3
Q

Emf:

A

Electromotive force

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4
Q

Ohms law:

A

E=I×R, the relationship between Volt, Current and Resistance

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5
Q

Continuity

A

Describes a complete path for electron movement from one point to another.

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6
Q

Power equation

A

P= IxE watt=amp x volt

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7
Q

Voltage drop (VD)

A

The loss of emf (volt) between 2 wires or across a load.

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8
Q

Causes of VD

A

An electrical load, loose wire or undersized conductor.

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9
Q

Ampacity

A

The amount of current a conductor can safely carry with out overheating.

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10
Q

Volt and resistance determine the mount if electron flow. Watt measures. . .

A

The rate of energy conversion

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11
Q

Self Inductance

A

When varying lines of magnetic flux induce an EMF in a coil, the coil has self inductance.

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12
Q

Mutual Inductance

A

When varying lines of magnetic flux induce an EMF in an adjacent coil, the coils have mutual Inductance. Based of transformers.

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13
Q

Inductive Reactance

A

A type of resistance that us produced when a coil of wire carries an alternating current.

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14
Q

LRA

A

Locked Rotor Amp, the amp draw of a motor on start up

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15
Q

FLA

A

Full Liad Amp, the Amp draw of a motor at peak torque and hp. Full load.

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16
Q

RLA

A

Rated Load Amp, the Amp draw of a compressor when operating at its rated load, rated voltage and rated frequency.

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17
Q

Resistance is used to measure for

A

An electrical short
A grounded connection
An open
A higher than normal resistance

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18
Q

Capacitors are rated in

A

Farads/ microfarads

19
Q

Define power

A

The rate at which work is being done

20
Q

True power

A

The amount of power actually used by a load (W)

21
Q

Reactive power

A

The power absorbed and returned by the circuit without doing any useful work. (VAR)

22
Q

Apparent power

A

The total power (True + Reactive) in the circuit (VA)

23
Q

Inductive reactance

A

Resistance caused by magnetic fields, like a motor

24
Q

Capacitive reactance

A

Resistance caused by the shortage of electrons

25
Q

Power factor

A

PF = True power (W) / Apparent Power (VA)
The lower the power factor, the greater the amount of current that must be carried to handle the load.

26
Q

Phase splitting

A

Start and run windings have diff Inductance values, the current flowing through the start winding is out of phase with the run winding, split phase causes a rotating magnetic field in the stator causing the rotator to start turning.

27
Q

Split phase motor

A

A single phase induction motor used in applications that operate in the fractional hp range

28
Q

Variable Frequency Drive (VFD)

A

Control circuit that modifies the frequency of signals to ac motors.
Uses a rectifier to change 60hz ac to DC then back to AC at a different frequency.

29
Q

An electrical property that opposes the current change in an AC circuit.

A

Inductance

30
Q

When too much current flows through an electrical circuit.

A

Overload

31
Q

A unit of electrical power, equivalent to the watt.

A

Volt-amp (VA)

32
Q

Thermistor

A

Regulates the flow of current by changing its resistance based on heat.

33
Q

Bonding

A

A continuous electrical connection of all the metal parts in an electrical system.

34
Q

Short circuit

A

When current is unintentionally routed around a component or load instead of through it.

35
Q

Diode

A

A solid state device that allows DC current to flow in one direction.

36
Q

Anode

A

The positive side of a diode

37
Q

Cathode

A

The negative side of a diode

38
Q

Transducer

A

A device that converts the input signal from one form of energy to an output signal of another form of energy

39
Q

Diac

A

A diode for AC, allows current to flow in both directions

40
Q

Rectifier

A

An electronic circuit that converts AC to DC

41
Q

Inverter

A

Converts DC to AC

42
Q

Thermistor

A

A solid state device that changes its resistance as the temp of the thermistor changes.

43
Q

NTC vs PTC

A

Negative temp coefficient= thermistor decreases resistance as temp increases
Positive temp coefficient = thermistor increases resistance as temp increases.

HVAC Level 1 (9 decks)

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