Test 2: Chapter 12

Question 1

what is effeciancy?

Answer 1

comparison of the energy output of a device with the energy supplied

Question 2

electrical power

Answer 2

the rate at which electrical energy is produced or used. the unit of measurement for it are WATTS (w)

Question 3

how many watts make a J

Answer 3

1w= 1J/s

Question 4

what’s a KW.h

Answer 4

the unit for measuring electrical energy usage; the use of one killowatt of power for one hour

Question 5

energy in and energy out

Answer 5

energy in is how much energy a device requires, energy out is how much useful energy it puts out to do its task

Question 6

how many watts in a killowatt

Answer 6

1000W

Question 7

what’s the formula for calculating percent efficiency

Answer 7

energy out divided by energy in, multiplied by one hundred ( smaller number at the top always)

Question 8

what’s the formula for the cost to operate

Answer 8

power used times time times cost of electricity

Question 9

hydro electric generation

Answer 9

uses the force of water to create energy through the turbine that is moved because of the water. kinetic energy then becomes mechanical energy

renewable

Question 10

tidal generation

Answer 10

uses flowing water of the ocean to rotate the turbine through the oceans tides and waves

renewable

Question 11

thermal generation

Answer 11

involves heating water to produce steam, steam is then used to rotate a turbine

Question 12

what are the four ways of generating steam

Answer 12

-Combustion (burning fossil fuels)
-Solar (using sing light to heat water)
-Burning animal or plant materials
-Geothermal (uses thermal energy from deep in the earths crust)
-radioactive materials to heat water

Question 13

wind generation

Answer 13

blowing wind turns the turbine blades, which is connected to a generator, and produces electricity. if the jet stream was accessible lots of wind can be caught.

Question 14

wind cannot be…

Answer 14

held or preserved directly

Question 15

how much wind gets generated into electricity

Answer 15

59.3%

Question 16

what company makes most of ontarios wind mills

Answer 16

samsung

Question 17

list renewable electricity generations

Answer 17

solar
wind
tidal
hydro

Question 18

solar generation

Answer 18

uses sunlight and converts it into electrical energy

Question 19

benjamin franklin invented..

Answer 19

lighting rod and he didn’t patten it , in order to contribute to society

Question 20

volta invented..

Answer 20

the first battery

Question 21

what is resistance?

Answer 21

the difficulty of passing an electric current through a conductor (friction)

Question 22

faraday invented..

Answer 22

motors
generators
transformers

Question 23

thomas edison created..

Answer 23

light bulb

Question 24

what is the definition of current electricity

Answer 24

controlled flow of electrons through a conductor

Question 25

what did edison do to find his industrials

Answer 25

found the richest guy in the world (JP morgan)

Question 26

which current did edison find?

Answer 26

direct current

Question 27

which current did tesla find

Answer 27

alternating current

Question 28

tesla worked for…

Answer 28

edison

Question 29

why did tesla quit

Answer 29

edison lied about giving him 50k

Question 30

what did tesla sell

Answer 30

he sold his technology to westinghouse

Question 31

electrolyte

Answer 31

a substance that sets off a chemical reaction in the battery

Question 32

electric cell

Answer 32

a device that converts chemical energy into electrical energy (ex. batteries)

Question 33

primary cell

Answer 33

an electric cell that may only be used once (ex. duracell)

Question 34

secondary cell

Answer 34

an electric cell that can be recharged

Question 35

alternating current

Answer 35

a flow of electrons that alternates in direction in an electric circuit

Question 36

direct current

Answer 36

a flow of electrons in one direction through an electric circuit

Question 37

electrical energy

Answer 37

the energy provided by the flow of electrons in an electrical circuit (measured in joules)

Question 38

load

Answer 38

the part of an electric circuit that converts electrical energy into other forms of energy (light bulbs, toasters, refrigerators, air conditioners, etc)

Question 39

electric circuit

Answer 39

a continuous path in which electrons can flow (loop)

Question 40

what’s an example of a secondary cell

Answer 40

lead acid batteries, lithium ion batteries

Question 41

what are the steps to generating electricity

Answer 41

1. External force is applied 2. turbine or shaft rotation (from the force) 3. magnetic induction (the rotating shaft induced an electric current by electromagnetic induction 4. electricity generation (AC or DC electricity is generated) (MECHANICAL ENERGY INTO ELECTRIC ENERGY) 5. Voltage regulation (voltage is adjusted using transformers 6. transmission and distribution ( electricity is the transmitted to consumers) 7. usage (the electricity is used for applications)