Electical

Question 1

What is “E”?

Answer 1

Volts or electrical pressure

Base unit for the measurement of electrical pressure

Question 2

What is “I”?

Answer 2

Ampere or intensity

Base unit for measurement of electron flow

Question 3

What is R?

Answer 3

Ohm

Base unit for measurement of resistance or opposition to electron flow

Question 4

What is W

Answer 4

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

Watt= 1 volt x 1 amp

Question 5

What is the formula for calculating volts?

Answer 5

I x R

Question 6

What the rule for Rt in a series circuit?

Answer 6

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

Question 7

What is the rule for amperage in a series circuit

Answer 7

Amperage is constant or the same throughout the entire circuit

Question 8

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

Answer 8

Voltage drop must equal the total circuit voltage

Question 9

What is an insulator

Answer 9

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

Materials that have very few free electrons

Question 10

What must a tent trailer have?

Answer 10

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

Question 11

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

Answer 11

18 gauge

Question 12

What are the amps for the size of wire

Answer 12

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

Question 13

Where must a current protector be from the battery

Answer 13

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

Question 14

What is the minimum wiring rating in a trailer

Answer 14

90 degrees

Question 15

A ground must be?

Answer 15

Readily accessible for inspection and maintenance

Question 16

Why does an effective circuit consist of?

Answer 16

Power source
Conductor
Resistance 
Switch
Circuit protection

Question 17

What the volts for low voltage?

Answer 17

30v-750v

Question 18

What is the Rt in a parallel circuit?

Answer 18

The resistance total must always be less then the least resistance

Question 19

What’s is OHMs law?

Answer 19

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

Question 20

What is the North American standard hertz per second?

Answer 20

60hertz

Question 21

How many amps is lethal

Answer 21

100 milli amps

Question 22

What is extra low voltage and low voltage?

Answer 22

Extra low- 0-30v

Low 30-750v

Question 23

3 sources of AC power in an RV?

Answer 23

Shore power
Generator power
Inverter power

Question 24

What is RMS?

What is the percentage is in comparison to peak voltage?

Answer 24

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

Question 25

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

Answer 25

15 can have 1 30 - 8 50- 12

Question 26

What is the minimum AC wiring that can be used?

Answer 26

14 gauge copper wire

Question 27

What colour must the neutral be?

Answer 27

The neutral must be a white or natural grey

Question 28

What must all breaker panels have?

Answer 28

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

Question 29

What must your do with all AC connections?

Answer 29

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

Question 30

What receptacles must be class A GFCI protected?

Answer 30

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

Question 31

How many amps is considered lethal

Answer 31

100 mA

Question 32

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

Answer 32

Frequency is the number of cycles per second | And the standard is 60 hertz

Question 33

What is RMS

Answer 33

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

Question 34

What are the three RV power sources

Answer 34

Shore power Generator power Inverter power

Question 35

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

Answer 35

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

Question 36

How far along must an AC wire be supported?

Answer 36

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

Question 37

How fast will a class A GFCI trip?

Answer 37

Within 5 mills amps within 5 mill I second

Question 38

Where must the shore cord be located?

Answer 38

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

Question 39

How far away from the shower must the panel be?

Answer 39

1m

Question 40

What must wiring have when running through studs?

Answer 40

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

Question 41

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

Answer 41

Maximum of 12

Question 42

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

Answer 42

1500W unless you have a switch

Question 43

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

Answer 43

6”

Question 44

How do you calculate the converters output?

Answer 44

Divide the output by the input Eg. In 12.7v at 50 amps - 12.7x50= 635 Out 120v at 6amps. -120x6=. 720 88%

Question 45

How does a electronic converter work?

Answer 45

Uses transistors to increase the frequency before stepping down the voltage

Question 46

How do you properly size a converter?

Answer 46

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

Question 47

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

Answer 47

Must install a selector switch