Basic Principals

Question 1

DC Battery’s and motors in light A/C

Answer 1

14V or 28v DC

Question 2

DC voltage in large aircraft

Answer 2

28v DC

Question 3

Modern Jet AC system

Answer 3

115/200v at 400hz
+ 24v dc battery for emergency

Question 4

Unipole System

Answer 4

Metal pole takes negative terminal back to battery

Question 5

Conductors

Answer 5

Low resistance
High conductivity
Free electrons

Question 6

Insulators

Answer 6

High resistance
Low conductivity
No free electrons

Question 7

Semi conductors

Answer 7

Insulator can be made into conductor
Free electrons can be created

Question 8

Conductivity

Answer 8

How easily electric charge can pass through a material

Question 9

Conductor examples:

Answer 9

Gold
Aluminium
Copper

Question 10

Insulator Examples:

Answer 10

Plastic
Rubber
Glass

Question 11

Examples of semi conductors

Answer 11

Germanium

Question 12

Impedance

Answer 12

Reactive and real loads being used

Question 13

Current Limiter

Answer 13

Allow the current to overload temporarily before rupturing
Higher melting point

Question 14

Overcurrent

Answer 14

Inrush of currents are normal and only last for a fraction of a second
Protective devices must not trip on short term overcurrent events