Chapter 1: Energy
4.5(2)
View linked note
Learn
Practice Test
Spaced Repetition
Match
FlashcardsCard Sorting
1/45
Study Analytics
Name | Mastery | Learn | Test | Matching | Spaced |
|---|
No study sessions yet.
46 Terms
1
New cards
Power equation without pd(letters)
I(2)R
2
New cards
Power equation(letters)
V x A
3
New cards
Energy transferred equation(letters)
W x s
4
New cards
power of an appliance is the energy it
transfers per second
5
New cards
Total energy transferred depends on
how long the appliance is on its power
6
New cards
Live wire
can give you an electric shock
7
New cards
Earth wire
green and yellow, for safety and protects the wiring
8
New cards
Neutral wire
blue, completes the circuit and balances it
9
New cards
Live wire
brown, provides the alternating current
10
New cards
mains supply is
ac
11
New cards
battery supply is
dc
12
New cards
In cool conditions
the thermistor resistance goes up
13
New cards
In hot conditions
the thermistor resistance drops
14
New cards
In darkness
LDR resistance in at its highest
15
New cards
In bright light
LDR resistance falls
16
New cards
LDR is a resistor that is
dependent on the intensity of light
17
New cards
a thermistor is a
temperature resistor
18
New cards
ohmic conductors have a
constant resistance
19
New cards
resistance unit
ohm
20
New cards
Charge flow equation(letters)
Q=It
21
New cards
voltmeter measures
potential difference in volts
22
New cards
ammeter measures
current in amps
23
New cards
Pd equation
a x q
24
New cards
Electric current is the flow of
electrical charge
25
New cards
Doing work
Energy transferred. Done when current flows or by a force moving an object
26
New cards
Kinetic energy equation
1/2 x mass x speed
27
New cards
Gravitational Potential energy equation
Mass x gravitational strength x height
28
New cards
Elastic Potential energy equation
1/2 x spring constant x extension
29
New cards
Specific heat capacity
The amount of energy needed to raise the temperature ok 1kg of a substance by 1 Celsius
30
New cards
Specific heat capacity equation
Change in thermal energy = mass x specific heat capacity x temperature change
31
New cards
Conservation of energy principle
Energy can be transferred usefully, stored or dissipated but can never be created or destroyed
32
New cards
Power equations(2)
Power = Energy transferred / time or Power = work done / time
33
New cards
Power
Rate of doing work
34
New cards
Conduction
Is the process where vibrating particles transfer energy to neighbouring particles
35
New cards
Convection
Where energetic particles particles move away from hotter to cooler regions
36
New cards
Efficiency equations(2)
Efficiency = useful output energy transfer / total input energy transfer or efficiency = useful power output / total power input
37
New cards
Non-renewable
Will run out
38
New cards
Non-renewable energy resources
Coal, gas, oil
39
New cards
Renewable
Will never run out
40
New cards
Renewable energy resources
Solar, wind, water waves, hydro-electricity, bio-fuels, tides, geothermal
41
New cards
Bio-fuels
Energy created from plant products or animal dung
42
New cards
Hydro-electric power
Requires the flooding of a valley by building a big dam
43
New cards
Wave power
Turbines in the water
44
New cards
Solar cells
Generate electric currents directly from sunlight
45
New cards
Geothermal power
Possible in volcanic area or where hot rocks lie quite near
46
New cards
Wind power
Putting wind turbines in windy areas like Scotland