Learning Task 1-12

Question 1

In a carbon Atom what is the outer shell called

Answer 1

Valence orbit

Question 2

How many valence electrons can you find in a semi-conductor?

Answer 2

4 valence electrons

Question 3

The fundamental laws of charged bodies?

Answer 3

• Like charges repel and unlike charges attract.
• The force between two charges at rest is directly proportional to the product of the magnitudes of the charge. And inversely proportional to the square of the distance between them.

Question 4

List six methods of producing electricity?

Answer 4

Heat
Magnetism 
Pressure
Light
Friction
Chemical

Question 5

How many electrons are equal to one coulomb?

Answer 5

6.24x10 to the power of 18

Question 6

What is voltage

Answer 6

Potential energy difference.

Question 7

What is resistance?

Answer 7

Opposition to current which converts electric energy into heat energy.

Question 8

What is polarity?

Answer 8

The charge at one point with respect to another.

Question 9

What is ohm?

Answer 9

Base unit of resistance.

Question 10

What is power?

Answer 10

Rate of doing work or using energy.

Question 11

What is ohms law?

Answer 11

The current flowing in a circuit is directly proportional to the voltage and inversely proportional to the resistance.

Question 12

Electrons flow from?

Answer 12

• to +

Question 13

Conventional flows from?

Answer 13

+ to -

Question 14

What is EMF?

Answer 14

The work per unit charge done by a source on the electric charges, to move them against the electric field.

Question 15

What is the law of conservation of energy?

Answer 15

Energy may never be created or destroyed. Electrical energy always come from some other form of energy.

Question 16

List 4 main types of electrical drawings?

Answer 16

Pictorial diagram
Block and one-line diagram
Wiring diagram
Schematic diagram

Question 17

What three things do you need to complete a circuit?

Answer 17

Source
Load
Conductor

Question 18

What is short circuit?

Answer 18

A parallel path of low resistance.

Question 19

The type of reading error that takes place when you don’t look at the needle straight on is called?

Answer 19

Parallax

Question 20

What is the carbon composition resister colour table.

Colour of bands?

Answer 20

Black- black 
Brown- beer
Red- rots 
Orange- our
Yellow- young 
Green- guts
Blue- but 
Violet- vodka 
Grey- goes 
White- well
Gold- get
Silver- some
No colour- now

Question 21

What are three types of fixed resisters?

Answer 21

Wire round resister
Film resister
Carbon composition resister

Question 22

What resister has the lowest watts rating?

Answer 22

Carbon composition resister

Question 23

Why is it important to switch contacts quickly?

Answer 23

To minimize arcing and burning of contacts.

Question 24

What accelerates the opening and closing of the contacts?

Answer 24

A spring action

Question 25

What are the three main classes of resisters?

Answer 25

Fixed resisters
Variable resisters
Adjustable resisters

Question 26

How are adjustable resisters adjusted?

Answer 26

Sliding collar being locked at some point on the coil to give it the desired resistance.

Question 27

What is the difference between an atom and a molecule?

Answer 27

A molecule must be independent but the atom does not have to be.

Question 28

A substance that is made up of Atoms of more then one type is a?

Answer 28

Compound.

Question 29

Anything that occupies space or has mass is referred to as?

Answer 29

Matter.

Question 30

The smallest portion an element can be broken down into and still posses the properties of that element is referred to as an?

Answer 30

Atom.

Question 31

% efficiency equals what?

Answer 31

Output watts / input watts X 100.

Question 32

State watts law.

Answer 32

The power in a circuit equals the product of the voltage and the current in the circuit.

Question 33

1 horse power is equal to how many watts?

Answer 33

746 watts

Question 34

Voltmeters are connected in?

Answer 34

Parallel.

Question 35

Ammeters are connected in?

Answer 35

Series.