Electrics 1 Charge and static energy

Question 1

In an atom, what is positive, neutral and negative

Answer 1

Proton +
Neutron -
Electron

Question 2

Lithium atom contains

Answer 2

• Electrons = 3
  + Protons = 3
  X Neutrons = 4

Question 3

Electrons move at what speed?

Answer 3

near the speed of light 186.000 miles per sec (299.792.458meters per sec)

Question 4

What weak bond would suggest that a material is a good conductor.

Answer 4

Covalent bond

Question 5

Six basic ways to provide the force to move electrons:

Answer 5

Friction – Static electricity
Chemical action – cells and batteries
Magnetism* – Generators and alternators
Heat – Thermocouples
Light – Photo electric cell
Pressure – piezo electric crystals

Question 6

EMF
PD

Answer 6

Electromotive force
Potential difference

Question 7

What is the forumula for ohms law

Answer 7

V = I x R

Question 8

Current is represented by, and the unit is?

Answer 8

Amp
A
I (impedance)

Question 9

A volt is a measure of __________ ________

Answer 9

electrical pressure

Question 10

Ohm is the measure of __________ __ ____

Answer 10

resistance to flow
R
Ω

Question 11

Frequency is measured in?

Answer 11

Hertz

Question 12

Electrical power is measured in?

Answer 12

Watts

Question 13

Capacitance is the ability to store charge and is measured in

Answer 13

Farads
kilofarad x 1000
megafarad x 1,000,000

Question 14

Power equation PIE

Answer 14

Power = Current x Voltage
watts = amps x EMF

Question 15

Light aircraft are AC or DC and what voltage?

Answer 15

DC
12 or 24

Question 16

Large aircraft also have an AC or DC system?

Answer 16

AC

Question 17

And aircraft battery must supply how much time in the event of an emergency?

Answer 17

30mins

Question 18

Describe the conductivity of a material with tightly bound electrons

Answer 18

Poor conductors

Question 19

Describe the conductivity of a material with a large number of free electrons

Answer 19

Good conductor

Question 20

Examples of good conductors are:

Answer 20

Cupper
Aluminium
Gold
Silver

Question 21

Examples of poor conductors

Answer 21

Plastic
rubber
wood
dry air

Question 22

The accumulation of electric charge on an object is known as

Answer 22

Static electricity

Question 23

Static can build on aircraft, why and when?

Answer 23

Flying through dry air including dry ice crystals

Question 24

What on an aircraft, that need checking pre-flight, is to do with static electricity?

Answer 24

Static discharge wicks are flexible wires
Trailing edge to control the static discharge back to the atmosphere

Question 25

To ensure the aircraft has no potential difference, what must you do to parts of the airframe?

Answer 25

Bond it together

Question 26

Excessive radio interference or other electrical interference could be caused by ____ __________ _______

Answer 26

poor electrical bonding

Question 27

Static wicks are not perfect. After landing there may still be a _________ __________ between the aircraft and the ground

Answer 27

potential difference

Question 28

Why do we earth an aircraft while fuelling?

Answer 28

Prevent any arcing between airframe and fuel nozzle

Question 29

A well bonded airframe can be used as a ______ _____ ______ for all electrical components or circuits.

Answer 29

common earth return