Current Electricity

Question 1

Electric Circuit

Answer 1

Continuous path in which electrons can flow

Question 2

Load

Answer 2

The part of an electric circuit that converts electrical energy into other forms of energy

Question 3

Switch

Answer 3

A device in the electric circuit that controls the flow of electrons by opening and closing the circuit

Question 4

Electrical energy

Answer 4

Energy provided by the flow of electrons in an electric circuit

Question 5

Electric Cell

Answer 5

A device that converts chemical energy into electrical energy

Question 6

Primary cell

Answer 6

An electric cell that may only be used once

Question 7

Secondary cell

Answer 7

An electric cell that can be recharged

Question 8

DC

Answer 8

Electrons flow in one direction

Question 9

AC

Answer 9

Electrons move back and fourth

Question 10

How is electricity generated?

Answer 10

•Electric generating stations convert mechanical energy into electrical energy
•External energy source pushes blades of turbine
•Turbine is connected to generator
•Coil of wire held 2 poles of magnetic generator
•Electrons flow in wire
•Move in transition lines to electrical outlet

Question 11

How do fossil fuels work?

Answer 11

•Fossil fuels are burned to heat water
•Creates steam
•Spins turbines
•Chemical - Thermal - Mechanical - Electrical

Question 12

Advantages to fossil fuels

Answer 12

•Cheap
•Employs a lot of people
•Infastructure already exists in many places

Question 13

How does nuclear energy work?

Answer 13

•Lake water
•Creates steam
•Nuclear generating stations
•Electrical energy

Question 14

Advantages/Disadvantages to nuclear energy

Answer 14

•Does not directly cause acid precipitation

•Radiactive waste
•Affects aquatic ecosystems
•Pollution
•Habitat loss

Question 15

How does hydro-electric energy work?

Answer 15

•Dam
•Resevoir
•Flow of water
•Turbine
•Generator
•Long distance power line

Question 16

Advantages/Disadvantages to hydro electric

Answer 16

•No pollution

•Dams affect watersheds
•Migration of fish disrupted
•Land areas may flood

Question 17

How does wind energy work?

Answer 17

•Wind
•Turbine
•Generator
•Electrical energy

Question 18

Advantages/Disadvantages to wind

Answer 18

•No pollution
•Easily removed or added

•Difficult to generate a steady supply

Question 19

How does Solar/Photovaltic energy work

Answer 19

•Light
•Solar panels
•Solar cell
•Electrical energy

Question 20

How does Solar/Photovaltic energy work

Answer 20

•Light
•Solar panels
•Solar cell
•Electrical energy

Question 21

How does biomass energy work?

Answer 21

•Biomass (waste)
•Steam
•Turbines
•Generator
•Electrical energy

Question 22

How does biomass energy work?

Answer 22

•Biomass (waste)
•Steam
•Turbines
•Generator
•Electrical energy

Question 23

Advantages/Disadvantages to biomass

Answer 23

•Continous supply of waste

•Releases methane that is later burned

Question 24

How does geothermal energy work?

Answer 24

•Heat from crust
•Hotsprings/geysers
•Pipes
•Steam
•Generator
•Electrical energy

Question 25

Advantages/Disadvantages to geothermal

Answer 25

•Produces large amounts of energy •Releases CO2 •Greenhouse effect •Increases the Earth's temperature

Question 26

How does tidal energy work?

Answer 26

•Tide •Tidal generating station •Water turbine •Generator •Electrical energy

Question 27

Advantages/Disadvantages to tidal

Answer 27

•No pollution •Difficult to find an area to build generating stations

Question 28

Ontario Energy Usage

Answer 28

Wind - 1% Nuclear - 52% Coal - 18% Natural Gas - 8% Hydro - 21%

Question 29

What is resistance

Answer 29

•Determined by how easily electrons can flow •Measure of how much electrons are slowed down when passing through a conductor •Measured in Ohms

Question 30

Resistor

Answer 30

Restricts/slows the flow of electrons to protect the circuit

Question 31

How is resistance useful

Answer 31

•By slowing e- flow, can convert electrical energy into other forms of energy •Allows us to use electricity for heat/light

Question 32

Things that affect resistance

Answer 32

•Type of material •Temperature •Cross sectional area/Diameter •Length

Question 33

Hazards

Answer 33

•Materials w/ higher resistance require more voltage to make e- flow •If current is too high for wire, wire will overheat/cause a fire •Short circuits

Question 34

Short circuit

Answer 34

When there is no electrical load in the circuit and the circuit overheats and catches fire

Question 35

Preventing an electrical fire

Answer 35

•Insert a device into circuit that will break/open the circuit if e- flow is too high for wire •Reatrict the current to a safe level

Question 36

Fuses

Answer 36

•Piece of metal that will melt/break the circuit if circuit temperature is too high for wire •Different ratings (15A, 5A) •One time use

Question 37

Circuit breaker

Answer 37

•That will bend and flip open the circuit by breaking flow of e- •Is reusable

Question 38

GFCI

Answer 38

•Ground Fault Circuit Interrupter •Shuts off electricity at the outlet if it's overloaded

Question 39

Conventional current

Answer 39

Positive to negative

Question 40

Electron flow

Answer 40

Negative to positive

Question 41

Amps

Answer 41

Measures current (I)

Question 42

Voltage

Answer 42

•Potential difference •Difference in electric potential energy per unit of charge measured at 2 points

Question 43

Adding more lights in SERIES

Answer 43

Lights get dimmer

Question 44

Adding more lights in PARALLEL

Answer 44

Light remains the same

Question 45

Time of use

Answer 45

Electricity costs more/less depending on the time of day/week you use it

Question 46

Tiered pricing

Answer 46

Once you use a certain amount of electricity, all electricity used after that is an additional charge

Question 47

Efficiency

Answer 47

Eff = eOut/eIn

Question 48

Power

Answer 48

P=E/t P= I×V

Question 49

Energy

Answer 49

E=P×t