Electrical Principles and Technologies

Question 1

Current Electricity

Answer 1

the flow of electricity in an electronic circuit

Question 2

Static Electricity

Answer 2

A stationary electric charge

Question 3

Law of charges

Answer 3

positive + positive = repel
negative + positive = attract
negative + negative = repel

Question 4

Conductor

Answer 4

a substance or material that allows electricity to flow through it.

Question 5

Insulator

Answer 5

Materials that do not allow electricity to pass through them

Question 6

voltage

Answer 6

how much energy there is in a circuit

Question 7

current

Answer 7

how much charge is flowing through a wire.

Question 8

parrallel circut

Answer 8

a circuit where switches can turn certain parts on or off, each light bulb will contain the same amount of power.

Question 9

series circut

Answer 9

a circut where all device turn on or off with one switch.

Question 10

closed circuit

Answer 10

electrons can travel through a wire without being interrupted

Question 11

open circuit

Answer 11

no energy is being passed through a wire (no power)

Question 12

resistance

Answer 12

Resistance is a measure of the resistance to current flow in an electrical circuit. Resistance is measured in ohms.

Question 13

ohms law

Answer 13

R = V/I
V = I x R
I = V/R

Question 14

mechanical energy

Answer 14

energy that results in motion. e.g. windmills, cycling, human body.

Question 15

chemical energy

Answer 15

energy stored in chemicals, released in chemical reactions. e.g. food, batteries, explosives, ice packs, gasoline or any fuel.

Question 16

electrical energy

Answer 16

energy of charged particles, released when traveled place to place. e.g. phone, lamp, devices.

Question 17

thermal energy

Answer 17

energy from heat. e.g. hair dryer, straightener, baking, heat from sun.

Question 18

efficiency

Answer 18

useful energy output/useful energy input x 100

Question 19

laws of thermodynamics

Answer 19

energy cannot be created or destroyed. No energy conversion process in 100% efficient.

Question 20

Generator

Answer 20

A device that converts mechanical energy into electrical energy

Question 21

Magnetism

Answer 21

Magnetism is the force exerted by magnets when they attract or repel each other

Question 22

Armature

Answer 22

usually rotating part of an electric machine (such as a generator or motor)

Question 23

Commutator

Answer 23

a rotatory electrical switch that reverses the direction of current between the rotor and the external circuit periodically.

Question 24

Electromagnet

Answer 24

a core of magnetic material (such as iron) surrounded by a coil of wire through which an electric current is passed to magnetize the core.

Question 25

St. Louis Motor

Answer 25

a motor that is powered by direct current.

Question 26

Alternating Current

Answer 26

relies on the principles of magnetism to create an electric current that alternates directions.

Question 27

Direct Current

Answer 27

an electrical current that flows in one direction