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Physics > Test 2: Chapter 12 > Flashcards

Test 2: Chapter 12 Flashcards

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1
Q

what is effeciancy?

A

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

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2
Q

electrical power

A

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

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3
Q

how many watts make a J

A

1w= 1J/s

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4
Q

what’s a KW.h

A

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

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5
Q

energy in and energy out

A

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

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6
Q

how many watts in a killowatt

A

1000W

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7
Q

what’s the formula for calculating percent efficiency

A

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

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8
Q

what’s the formula for the cost to operate

A

power used times time times cost of electricity

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9
Q

hydro electric generation

A

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

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10
Q

tidal generation

A

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

renewable

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11
Q

thermal generation

A

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

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12
Q

what are the four ways of generating steam

A

-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

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13
Q

wind generation

A

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.

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14
Q

wind cannot be…

A

held or preserved directly

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15
Q

how much wind gets generated into electricity

A

59.3%

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16
Q

what company makes most of ontarios wind mills

A

samsung

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17
Q

list renewable electricity generations

A

solar
wind
tidal
hydro

18
Q

solar generation

A

uses sunlight and converts it into electrical energy

19
Q

benjamin franklin invented..

A

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

20
Q

volta invented..

A

the first battery

21
Q

what is resistance?

A

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

22
Q

faraday invented..

A

motors
generators
transformers

23
Q

thomas edison created..

A

light bulb

24
Q

what is the definition of current electricity

A

controlled flow of electrons through a conductor

25
Q

what did edison do to find his industrials

A

found the richest guy in the world (JP morgan)

26
Q

which current did edison find?

A

direct current

27
Q

which current did tesla find

A

alternating current

28
Q

tesla worked for…

A

edison

29
Q

why did tesla quit

A

edison lied about giving him 50k

30
Q

what did tesla sell

A

he sold his technology to westinghouse

31
Q

electrolyte

A

a substance that sets off a chemical reaction in the battery

32
Q

electric cell

A

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

33
Q

primary cell

A

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

34
Q

secondary cell

A

an electric cell that can be recharged

35
Q

alternating current

A

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

36
Q

direct current

A

a flow of electrons in one direction through an electric circuit

37
Q

electrical energy

A

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

38
Q

load

A

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

(light bulbs, toasters, refrigerators, air conditioners, etc)

39
Q

electric circuit

A

a continuous path in which electrons can flow (loop)

40
Q

what’s an example of a secondary cell

A

lead acid batteries, lithium ion batteries

41
Q

what are the steps to generating electricity

A
  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)

Physics (2 decks)

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