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Nat 5 Physics > Unit 3 > Flashcards

Unit 3 Flashcards

1
Q

What is resistance?

A

How much of a component opposes the flow of current

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2
Q

As total resistance increases what happens to the current?

A

It decreases

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3
Q

What is resistance measured in?

A

Ohms

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4
Q

What kind of charge does an electron have?

A

Negative

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5
Q

What kind of charge does a proton have?

A

Positive

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6
Q

What do objects with the same charge do when placed close together?

A

Repel each other

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7
Q

What do objects with opposite charge do when paced close together?

A

Attract each other

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8
Q

Are electrons free to move in a conductor?

A

Yes

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9
Q

Are electrons free to move in insulators?

A

No

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10
Q

What happens when two insulators a rubbed together?

A

Become electrically charged - transfer electrons between them though friction

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11
Q

How are the comments linked in a series circuit?

A

In a loop

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12
Q

How would make an object positively/ negatively charged?

A

Electrons must be added/ removed

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13
Q

What is current?

A

The amount of charge flowing per second

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14
Q

What is current measured in?

A

Amperes (A)

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15
Q

What is one amp equal to?

A

One columb per second

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16
Q

What is an electric field?

A

The region around an electric charge

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17
Q

What do electrical field lines indicate?

A

The force exerted on a positive electric charge. Lines closer together - greater force exerted

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18
Q

What is voltage?

A

A measure of the energy given to the charges in a circuit

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19
Q

What is voltage measured in?

A

Volts (V)

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20
Q

What is potential difference?

A

Measure of the difference in energy across two points in a circuit

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21
Q

What does one volt equal?

A

One joule per coulomb

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22
Q

What is a voltage divider circuit?

A

Uses two or more resistors in series to provide a part of a supply voltage

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23
Q

Why are voltage divider circuits used?

A

To prevent a component getting damaged

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24
Q

In a voltage divider circuit is the current equal at all points?

A

Yes

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25
When temperature is increased on a thermistor, what happens to the resistance?
It decreases
26
When light increases in a LDR, what happens to the resistance?
Decreases
27
What does a diode allow the current to do in a circuit?
Flow in one direction
28
What can a diode do to the power in a circuit?
Change it from AC to DC
29
What is a transistor?
A voltage controlled switch, responds to a change at the input
30
What are the two types of transistors?
Bi-polar transistor and MOSFET
31
What are capacitors?
Components that store charge and energy
32
What happens when a capacitor is connected to a power supply?
Capacitor charges and a potential difference is created across the capacitor
33
When resistance increases, what happens to the time taken for capacitor to charge?
Greater time to charge
34
Capacitors can be used in what type of circuits?
In timing circuits, eg-alarms
35
What is power?
How much energy is transferred per second
36
What is power measured in?
Watts (W)
37
How is power loss in transmission lines calculated?
P=I^2R
38
What does a step up transformer in power lines do?
Increases voltage across transmission lines
39
Wha does a step down transformer do in transmission lines?
Reduces voltage to a safe level
40
How is power loss reduced in transmission lines?
Voltage is increased meaning current decreases
41
What is a fuse?
A wire with a low melting point
42
If the current in a circuit is too high what happens to the fuse?
Heats up and melts
43
What is a ring circuit used for?
Used to connect a set of main sockets
44
What are some advantages of ring circuits?
Lower current in wires, thinner wires (less current), low cost, mains sockets can be easily added/removed
45
What is energy measured in?
Joules (J)
46
What is gravitational potential energy?
A object gains this energy when it is raised
47
What is kinetic energy?
An object gains this energy when it's moving
48
Can energy be created or destroyed?
No energy is lost or transformed from one type to another
49
When a ball is dropped what kind of energy has it got?
Potential energy hen when dropped it is transformed into kinetic energy
50
During every energy transfer some energy is lost to the surroundings as what?
Heat energy
51
What does lost energy equal?
Initial energy - final energy
52
What is the efficiency of a device?
How much of the energy input is transformed into useful energy output
53
What is temperature?
A measure of how hot or cold an object is
54
To find the temperature in kelvin what do you do?
Tc + 273
55
When a substance is heated what happens to the atoms?
Atoms vibrate faster and kinetic energy of atoms increases
56
What is conduction?
Thermal energy is transferred by vibrating atoms
57
What is convection?
Thermal energy is transferred by movement of atoms within a substance (only happens in liquids and gases)
58
What is radiation?
Thermal energy is radiated as electromagnetic waves
59
What is specific heat capacity?
The amount of heat energy required to change the temperature of 1 kg of a substance by 1 degree
60
What is pressure?
The force per unit area
61
What is pressure measured in?
Pascals (Pa)
62
What is an example of high pressure?
Sharp knife through food
63
What is an example of low pressure?
Snow boots
64
In a kinetic model of gas does each particle have different values of kinetic energy?
Yes, they move at different velocities
65
What is Boyle's Law?
Pressure is inversely proportional to a fixed mass of gas at a constant temperature
66
What is the equation for Boyle's Law?
p1V1 = p2V2
67
What is the Pressure Law?
For a fixed mass of gas at a constant volume , pressure is directly proportional to temperature
68
What is the equation for Pressure Law?
p1/T1 = p2/T2
69
What is Charles' Law?
As temperature increases, volume increases. For a fixed mass of gas at a constant pressure
70
What is the equation for Charles' Law?
V1/T1 = V2/T2
71
What is the general gas equation?
p1V1/T1 = p2V2/T2

Nat 5 Physics (3 decks)

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