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Rv > Electical > Flashcards

Electical Flashcards

1
Q

What is “E”?

A

Volts or electrical pressure

Base unit for the measurement of electrical pressure

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2
Q

What is “I”?

A

Ampere or intensity

Base unit for measurement of electron flow

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3
Q

What is R?

A

Ohm

Base unit for measurement of resistance or opposition to electron flow

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4
Q

What is W

A

Watts
Base unit for the measurement of resistance or opposition of electrical power consumption

Watt= 1 volt x 1 amp

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5
Q

What is the formula for calculating volts?

A

I x R

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6
Q

What the rule for Rt in a series circuit?

A

Resistance total is equivalent to all the resistance of all resisters added together

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7
Q

What is the rule for amperage in a series circuit

A

Amperage is constant or the same throughout the entire circuit

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8
Q

What is the rule for voltage drop in a series circuit?

A

Voltage drop must equal the total circuit voltage

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9
Q

What is an insulator

A

A material that has 5-8 electrons in the outer valance ring

Materials that have very few free electrons

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10
Q

What must a tent trailer have?

A

They must have an automatic disconnect for the lights when folded down

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11
Q

What is the minimum sized wire you can use on a unit?

A

18 gauge

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12
Q

What are the amps for the size of wire

A 
5a-18G
10a- 16G
15a- 14G
20a- 12G
30a- 10G
40a- 8G
50a- 6G
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13
Q

Where must a current protector be from the battery

A

5ft from the battery and within 18” of the inside the unit

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14
Q

What is the minimum wiring rating in a trailer

A

90 degrees

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15
Q

A ground must be?

A

Readily accessible for inspection and maintenance

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16
Q

Why does an effective circuit consist of?

A 
Power source
Conductor
Resistance 
Switch
Circuit protection
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17
Q

What the volts for low voltage?

A

30v-750v

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18
Q

What is the Rt in a parallel circuit?

A

The resistance total must always be less then the least resistance

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19
Q

What’s is OHMs law?

A

It takes one volt of potential to move one ampere of current through one ohm or resistance

20
Q

What is the North American standard hertz per second?

A

60hertz

21
Q

How many amps is lethal

A

100 milli amps

22
Q

What is extra low voltage and low voltage?

A

Extra low- 0-30v

Low 30-750v

23
Q

3 sources of AC power in an RV?

A

Shore power
Generator power
Inverter power

24
Q

What is RMS?

What is the percentage is in comparison to peak voltage?

A

It’s the average usable or practical voltage and it’s 70% of peak voltage

25
Q

How many branch circuits can
15 amp
30amp
50amp have?

A

15 can have 1
30 - 8
50- 12

26
Q

What is the minimum AC wiring that can be used?

A

14 gauge copper wire

27
Q

What colour must the neutral be?

A

The neutral must be a white or natural grey

28
Q

What must all breaker panels have?

A

Must have a dead front that needs a tool to take off

29
Q

What must your do with all AC connections?

A

They must be inside a junction box and must be accessible for maintenance

30
Q

What receptacles must be class A GFCI protected?

A

Exterior plugs
Bathroom plugs
And plug within 6 feet of running water

31
Q

How many amps is considered lethal

A

100 mA

32
Q

What is frequency and what is the North American standard frequency?

A

Frequency is the number of cycles per second

And the standard is 60 hertz

33
Q

What is RMS

A

It is the average or practical voltage and it is .707 or 70 percent of peak voltage

34
Q

What are the three RV power sources

A

Shore power
Generator power
Inverter power

35
Q

How many branch circuits can
15 amp have?
30 “?
50 “”?

A

15 amp- 1
30amp- 8
50amp- 12

36
Q

How far along must an AC wire be supported?

A

In the first 12” of the box and every 5 feet along the run

37
Q

How fast will a class A GFCI trip?

A

Within 5 mills amps within 5 mill I second

38
Q

Where must the shore cord be located?

A

Must be on the left side within 15 feet of the rear

39
Q

How far away from the shower must the panel be?

A

1m

40
Q

What must wiring have when running through studs?

A

Must be 1.25 inches away from the outside of the stud or else it must be protected

41
Q

How many outlets can you put on a 2 wire branch?

A

Maximum of 12

42
Q

How many watts before you need to put cooking and cooking appliances on their own circuit?

A

1500W unless you have a switch

43
Q

How much extra wire should you have inside the junction boxes?

A

6”

44
Q

How do you calculate the converters output?

A

Divide the output by the input

Eg.

In 12.7v at 50 amps - 12.7x50= 635
Out 120v at 6amps. -120x6=. 720
88%

45
Q

How does a electronic converter work?

A

Uses transistors to increase the frequency before stepping down the voltage

46
Q

How do you properly size a converter?

A

Take 100% of first 20
Take 50% of the next 20
Take 25% of what’s left

47
Q

What must you install if you need to put 2 high amperage appliances on one 30 amp breaker?

A

Must install a selector switch

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