# P1 Knowledge Builder

Studied by 1 person
0.0(0)
get a hint
hint

What is the formula for working out kinetic energy?

1 / 165

## Tags and Description

multiple question

### 166 Terms

1

What is the formula for working out kinetic energy?

Kinetic energy = ½ x mass x speed^2

New cards
2

What is the standard unit for mass?

Kilograms

New cards
3

What is the standard unit for speed?

m/s (meters per second)

New cards
4

What is the standard unit for kinetic energy?

Joules

New cards
5

What is the standard unit for elastic potential energy?

Joules

New cards
6

What is the standard unit for spring constant?

Newtons per metre (N/m)

New cards
7

What is the standard unit for extension in the elastic potential energy equation?

Metres

New cards
8

What is the formula for gravitational potential energy

G.P.E = mass x gravitational field strength x height

New cards
9

What is the standard unit for gravitational field strength?

N/kg (newtons per kilograms)

New cards
10

What is the standard unit for specific heat capacity?

Joules per kilogram per degree Celsius (J/KgoC)

New cards
11

What is this the definition of: The amount of energy required to raise the temperature of 1kg of a substance by 1oC

Specific Heat Capacity

New cards
12

What is defined as the rate at which energy is transferred or work is done?

Power

New cards
13

What is the standard unit for power?

Watts

New cards
14

What is the equation that links power, energy transferred and time?

Power =Energy transferred Time

New cards
15

What is the equation that links power, work done and time?

Power =Work Done Time

New cards
16

What is energy transferred the same as?

Work done

New cards
17

An energy transfer of 1 joule per second is equal to a power of?

1 Watt

New cards
18

If two electric motors both lift the same weight, the same height which will do it faster?

The more powerful one

New cards
19

Energy can be transferred, stored or dissipated but cannot be

Created or destroyed

New cards
20

In what type of system is there no net change to the total energy?

Closed

New cards
21

How can we reduce unwanted energy transfers?

• Lubrication

• Use of thermal insulation

New cards
22

How does increasing the thermal conductivity of a material affect the rate of energy transfer by conduction?

It increases it

New cards
23

What factors affect the rate of cooling of a building?

• Thickness of walls

• Thermal conductivity of walls

New cards
24

How do you work out efficiency from input and output energy?

Efficiency =Useful output energy transfer /Total input energy transfer

New cards
25

How do you work out efficiency from power input and output

Efficiency =Useful power output /Total power input

New cards
26

What are the three main types of fossil fuels?

Coal, Oil, Gas

New cards
27

Name the main non-renewable energy resources?

Fossil fuels, Nuclear fuel

New cards
28

Name 6 renewable energy resources

Biofuel, Wind, Hydro-electricity, Geothermal, Tidal, Solar, Water waves

New cards
29

What type of resource is one that is being replenished as it is used?

Renewable

New cards
30

What is required for an electrical charge to flow through a closed circuit?

A potential difference

New cards
31

What is the flow of electrical charge?

electrical current

New cards
32

What equation links charge flow, current and time?

Charge flow = Current x Time

New cards
33

What is the standard unit for current?

Amps

New cards
34

What is the standard unit for Charge flow?

Coulombs

New cards
35

What is the standard unit for time?

Seconds

New cards
36

What is the equation that links resistance, potential difference and current?

Potential difference = Current x Resistance

New cards
37

What two things does the current flowing through a component depend on?

Resistance Potential Difference

New cards
38

If you increase the resistance of a component what happens to the current, for a set potential difference

Decreases

New cards
39

What is the standard unit for resistance?

Ohms

New cards
40

What is the standard unit for potential difference?

Volts

New cards
41

How are current and potential difference linked in an ohmic conductor

They are directly proportional

New cards
42

Through which component is resistance constant?

Ohmic conductor

New cards
43

How does the resistance of a filament lamp change as the temperature increases?

It increases

New cards
44

How does the current flow in a diode?

only flows in one direction

New cards
45

What can you tell me about the resistance in a diode?

Very high in the reverse direction

New cards
46

How does the resistance of a thermistor change as the temperature increases?

It decreases

New cards
47

How does the resistance of an LDR change as light intensity increases?

It decreases

New cards
48

What could LDR's be used for

Switching lights on when it gets dark

New cards
49

What could a thermistor be used for?

In a thermostat to control heating

New cards
50

What is the current like in a series circuit?

the same everywhere

New cards
51

What is the total resistance of two components in a series circuit?

It is the sum of the resistance of each component

New cards
52

What is the total resistance of two resistors connected in parallel?

Less than the resistance of the smallest resistor

New cards
53

What type of supply is the mains electricity in the UK?

AC

New cards
54

What is the frequency of the domestic electricity supply in the UK?

50Hz

New cards
55

What is the voltage of the domestic electricity supply in the UK?

230V

New cards
56

What type of potential difference varies between a positive and negative value?

Alternating

New cards
57

What type of potential difference is only found in the positive?

Direct

New cards
58

How are most electrical appliances connected to the mains?

Using a three-cord cable

New cards
59

What colour is the live wire?

Brown

New cards
60

What colour is the neutral wire?

Blue

New cards
61

What colour is the earth wire?

Green and yellow stripes

New cards
62

What does the live wire carry?

The alternating potential difference from the supply

New cards
63

What does the neutral wire do in a plug?

Completes the circuit

New cards
64

What does the earth wire do in a plug?

It is a safety wire to stop an appliance becoming live

New cards
65

What is the potential difference between the live wire and the earth?

230V

New cards
66

What is the voltage of the neutral wire

At or close to 0V

New cards
67

What is the voltage of the earth wire

0V, unless there is a fault

New cards
68

What equation links power, potential difference and current?

Power = Potential difference x Current

New cards
69

What equation links current, resistance and power?

Power = (Current)2 x Resistance

New cards
70

What does the amount of energy an appliance transfers rely on?

• How long the appliance is switched on for

• The power of the appliance

New cards
71

What is done when charge flows in a circuit?

Work

New cards
72

What equation links energy transferred, power and time?

Energy transferred = Power x Time

New cards
73

What equation links charge flow, potential difference and energy transferred

Energy transferred = charge Flow x Potential Difference

New cards
74

What is the National Grid?

A system of cables and transformers linking power stations to consumers

New cards
75

What is transferred from power stations to consumers using the National Grid?

Electrical power

New cards
76

What are used to increase the potential difference from the power station to the transmission cables?

Step-up transformers

New cards
77

What are used to decrease the potential difference for domestic use in the National Grid?

Step- down transformers

New cards
78

What is the potential difference like in the transmission cables in the National Grid?

Very high

New cards
79

What is the equation to work out density?

density= mass/volume

New cards
80

Standard unit for density?

Kg/m³

New cards
81

When a substance changes state what happens to the mass?

It stays the same

New cards
82

Why is a physical change different from a chemical change?

In physical changes the material recovers its original properties if the change is reversed

New cards
83

What do we call the energy stored inside a system by the particles that make up the system?

Internal energy

New cards
84

What is the internal energy of a system made up of

The total kinetic and potential energy of all the particles

New cards
85

What effect does a change of state have on the overall temperature of a system?

None

New cards
86

What does the increase in temperature of a material depend on?

• The mass of the substance

• The type of material

• The energy input into the system

New cards
87

What is the energy needed for a substance to change state called?

Latent heat

New cards
88

What is the amount of energy required to change the state of one kilogram of a substance with no change in temperature?

Specific Latent Heat

New cards
89

What can a gas do?

Compressed or expanded

New cards
90

What can a pressure produce?

A net force at right angles to the wall of the container (or any surface)

New cards
91

What is pressure measured in?

Pascals (Pa)

New cards
92

What is volume measured in?

m^3

New cards
93

What is the equation that links volume, pressure and constant, for a fixed mass of gas held at a constant temperature?

pressure × volume = constant

New cards
94

What is work the transfer of?

Energy by a force

New cards
95

What will work do to a gas?

Increase the internal energy and temperature

New cards
96

What is the unit for specific latent heat?

J/kg

New cards
97

What is the specific latent heat of fusion?

The change of state from solid to liquid

New cards
98

What is the specific latent heat of vaporisation?

The change of state from liquid to vapour

New cards
99

How do the particles in a gas move?

randomly

New cards
100

What is the temperature of a gas related to?

The average kinetic energy of the molecules

New cards

## Explore top notes

Note
Studied by 9 people
Updated ... ago
5.0 Stars(1)
Note
Studied by 68 people
Updated ... ago
4.7 Stars(3)
Note
Studied by 11 people
Updated ... ago
5.0 Stars(1)
Note
Studied by 3 people
Updated ... ago
5.0 Stars(1)
Note
Studied by 11 people
Updated ... ago
5.0 Stars(1)
Note
Studied by 8 people
Updated ... ago
4.0 Stars(1)
Note
Studied by 4 people
Updated ... ago
5.0 Stars(2)
Note
Studied by 59 people
Updated ... ago
5.0 Stars(1)

## Explore top flashcards

Flashcard191 terms
Studied by 7 people
Updated ... ago
5.0 Stars(1)
Flashcard21 terms
Studied by 3 people
Updated ... ago
5.0 Stars(1)
Flashcard25 terms
Studied by 7 people
Updated ... ago
5.0 Stars(1)
Flashcard96 terms
Studied by 12 people
Updated ... ago
4.0 Stars(1)
Flashcard57 terms
Studied by 30 people
Updated ... ago
5.0 Stars(1)
Flashcard53 terms
Studied by 23 people
Updated ... ago
4.0 Stars(1)
Flashcard168 terms
Studied by 1 person
Updated ... ago
5.0 Stars(1)
Flashcard121 terms
Studied by 7 people
Updated ... ago
5.0 Stars(1)