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p1 Flashcards

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1
Q

name all of the energy types

A

magnetic, kinetic, heat, light, gravitational potential, chemical, sound, elastic potential, electrical, nuclear

(most kids hate learning g c s e energy names)

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2
Q

what is the law of conservation of energy?

A

energy can be transferred or dissipated. it can not be created or destroyed.

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3
Q

what is work done?

A

work is defined as the amount of force needed to move an object a certain distance

it is measure of an energy transferred to or from an object which allows it to be moved

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4
Q

what’s the equation for work done?

A

w = f x s

w - work done ( J, joules or newton -metres, Nm)
f - force (N, newtons)
s - distance (metres,m)

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5
Q

what’s the equation for gravitational potential energy?

A

Ep = mgh

Ep - GPE
m - mass (kg)
g - gravitational field strength (9.8N/kg on earth)
h - height (m)

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6
Q

what’s the equation for kinetic energy?

A

Ek = 1/2mv^2

Ek - kinetic energy (joules J)
m - mass (kg)
v - velocity (m/s)

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7
Q

what’s the steps to follow when doing an equation?

A
  1. find variables
  2. choose equation
  3. check units
  4. substitute
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8
Q

what’s the relation between GPE and Ek

A

if an object goes straight up into the air Ek is converted to GPE

in science we assume that this energy transfer is 100% efficient

the opposite would be true for an object falling to the floor

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9
Q

F = ke

A

Force(N) = spring constant (Nm) x extension (m)

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10
Q

what’s the equation for elastic potential?

A

Ee = 1/2ke^2

Ee - elastic potential energy (J)
k - spring constant (Nm)
e - extension/ compression (m)

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11
Q

what is power?

A

power is the amount of energy transferred (work done) by an object per unit of time

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12
Q

what’s the equation for power?

A

power = energy/ time

power - watts (W)
energy - (J)
time (seconds, s)

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13
Q

what happens to the energy wasted in a lightbulb

A

it’s transferred to surroundings by heating

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14
Q

why is it useful to have both a wind turbine and a fossil fuel generator 2 reasons

A

sometimes there’s no wind

when there is wind less fuel is burned

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15
Q

what is a non renewable energy resource

A

an energy resource that can’t be replenished as it’s used

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16
Q

why does the temperature of a heater change quickest after the heater is switched off

A

there is a bigger temperature difference between the water and the surrounding air so the transfer of energy is faster

17
Q

why would fitting an insulating jacket to heater be beneficial

A

water stays hot for longer

so heater is on for less time

so cost of jacket can soon be recovered from

18
Q

name all the non renewable energy resources

A
  • oil
  • coal
  • natural gas
  • nuclear
19
Q

name the 6 renewable energy resources

A
  • tidal energy
  • solar energy
  • wind energy
  • geothermal energy
  • biomass energy
  • hydroelectric energy
20
Q

name the energy transfer or tidal barrage

A

kinetic to electrical
(water is trapped as tide comes in. turbines spin)

21
Q

name the energy transfer of hydroelectric dams

A

gravitational potential energy to electrical

22
Q

name two disadvantages of nuclear energy

A
  1. produces harmful radioactive waste that needs to be buried for a long time
  2. high cost of commissioning and decommissioning
23
Q

what is u - value

A

how effective a material is as an insulator

24
Q

how is the u value of a house affected by increasing the amount of insulation?

A

u-value decreases

25
Q

name four advantages of nuclear energy

A
  1. no carbon dioxide so does not contribute to GHE
  2. no sulphur dioxide produced so does not contribute to acid rain
  3. reliable
  4. more energy produced than the same mass of fossil fuels
26
Q

four advantages of solar energy

A
  1. renewable
  2. no carbon dioxide produced so does not contribute to the GHE
  3. no sulphur dioxide produced so does not contribute to acid rain
  4. no fuel cost
27
Q

name one disadvantage of solar energy

A

unreliable - doesn’t work when it’s cloudy or at night

28
Q

name four advantages of wind energy

A
  1. renewable
  2. no carbon dioxide so does not contribute to GHE
  3. no sulphur dioxide produced so does not contribute to acid rain
  4. no fuel cost
29
Q

name three disadvantages of wind energy

A
  1. unreliable - wind does not always blow so electricity is not always produced
  2. noise and visual pollution
  3. takes up a lot of land
30
Q

name three advantages of biomass energy

A
  1. renewable
  2. a way of disposing waste
  3. carbon neutral - carbon dioxide produced is balanced by carbon dioxide absorbed whilst producing it
31
Q

name a disadvantage of biomass energy

A

takes up a lot of land and consumes resources that are needed for food production

32
Q

name four advantages of geothermal energy

A
  1. renewable
  2. no carbon dioxide so does not contribute to GHE
  3. no sulphur dioxide produced so does not contribute to acid rain
  4. no fuel cost
33
Q

name four advantages of hydroelectric energy

A
  1. renewable
  2. no carbon dioxide so does not contribute to GHE
  3. no sulphur dioxide produced so does not contribute to acid rain
  4. no fuel cost
34
Q

name two disadvantages of geothermal energy

A
  1. expensive to drill underground to reach hot rocks
  2. power stations can only be built near natural hot springs
35
Q

name three disadvantages of hydroelectric energy

A
  1. expensive to build dams / reservoirs
  2. destroys habitats
  3. can lead to flooding
36
Q

name five advantages of tidal energy

A
  1. renewable
  2. no carbon dioxide so does not contribute to GHE
  3. no sulphur dioxide produced so does not contribute to acid rain
  4. no fuel cost
  5. reliable - tide does not depend on weather
37
Q

name a disadvantage of tidal energy

A

destroys aquatic habitats and kills aquatic animals

38
Q

give two advantages of using a data logger and temperature probes over a thermometer

A
  1. higher resolution
  2. reduced risk of misreading the instrument
39
Q

give two reasons why it would not be economical to connect houses in a mountainous area to the national grid

A
  1. high cost of installing overheard power lines or underground cables or pylons
  2. high cost as very long cables are needed

science (12 decks)

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