Unit 4: Electrical Principles and Technologies

Question 1

The first law of thermodynamics

Answer 1

Energy cannot be created or destroyed only transferred from one form to another

Question 2

The second law of thermodynamics

Answer 2

No transfer of energy is 100% efficient

Question 3

Thermal energy

Answer 3

Heat energy

Question 4

Electrical energy

Answer 4

Energy from electricity

Question 5

Chemical energy

Answer 5

energy stored in chemical and released with chemical reactions
(eg. Fire)

Question 6

Mechanical Energy

Answer 6

Energy created by a moving object
(eg. wind turbine)

Question 7

Electrochemical Cell

Answer 7

A device that creates electrical energy from chemical reactions. (eg. Cooper and Zinc in saltwater)

Question 8

Anode

Answer 8

Electrode that is negativly charged

Question 9

Cathode

Answer 9

Electrode that is positively charged

Question 10

Electrolyte

Answer 10

liquid or gel containing Ions. The electrolyte becomes conducted through ion movement.

Question 11

Electrode

Answer 11

An electrical conductor where electricity enters and leaves.

Question 12

Wet cell

Answer 12

Cell with a liquid or paste electrolyte. (car battery has a liquid electrolyte)

Question 13

Dry cell

Answer 13

A cell with a solid electrolyte. (eg. Some types of batteries)

Question 14

Primary cell

Answer 14

Cell that creates an electrical current through a chemical reaction.

Question 15

Secondary cell

Answer 15

An electric sell that is capable of being recharged.

Question 16

Salt bridge

Answer 16

Tube that contains electrolyte usually in gel form that provides contact between two solutions.

Question 17

Generator

Answer 17

A machine that converts mechanical energy into electricity

Question 18

Armature

Answer 18

The rotating coil of a electric motor.

Question 19

Electromagnet

Answer 19

A metal core that turns into a magnet due to the electrical current.

Question 20

Alternating current

Answer 20

Electrical current that can reverse its direction. Usually used in power tools/supplies.

Question 21

Magnetism

Answer 21

Attractive or repulsive forces created by electrical charge.

Question 22

St louis Motor

Answer 22

A motor that creates an electrical current from mechanical energy. The type of current power used is direct current.