1
Q
Draw the symbol for a cell
A
.
2
Q
Draw the symbol for a lamp
A
.
3
Q
Draw the symbol for a open switch
A
.
4
Q
Draw the symbol for a closed switch
A
.
5
Q
What is the flow of electrons in a circuit called?
A
An electric current
6
Q
What direction does the electric current flow?
A
The electric current flows from the negative end of the cell to the positive end.
7
Q
What happens in a circuit?
A
1) The electrons are carrying energy from the cell
2) They pass this energy to the components in the circuit e.g. lamp
3) In the lamp the electrical energy is transferred to light energy and thermal energy
8
Q
A
9
Q
What is the difference of when electrons leave and enter the cell?
A
When electrons return to the positive end of the cell, they are carrying less energy than when they left the negative end
10
Q
What direction is the conventional arrow drawn?
A
To the left - anticlockwise, opposite direction of electron flow
11
Q
What is a series circuit?
A
Has no branches, the current can only flow in one path
12
Q
What is an electric current?
A
An electric current is a flow of electric charge around a circuit.
13
Q
What is the unit for electrical current?
A
Ampere (A)
14
Q
What is the short for Ampere?
A
Amp/ amps
15
Q
What do you use to measure current in a circuit?
A
An ammeter
16
Q
Draw the symbol for an ammeter
A
.
17
Q
What are the characteristics of current in a series circuit?
A
1) Current is never used up in a series circuit
2) In a series circuit the current is the same all the way around
18
Q
What does a parallel circuit contain?
A
Parallel circuits contain branches
19
Q
What does the current in the branches equal?
A
The current in the branches add up to the total current leaving the cell
20
Q
What are the energy transfers involved in a series circuit with a lamp, switch and cell?
A
1) The cell has a store of chemical energy
2) This is transferred to electrical energy which is carried by the electrons passing out of the cell
3) When the electrons pass through components - lamp, the electrical energy is transferred to the other forms of energy - light and thermal energy
21
Q
What is voltage the same as?
A
Potential difference
22
Q
What is potential difference the same as?
A
Voltage
23
Q
What do you use to measure the potential difference in a circuit?
A
Voltmeter
24
Q
Draw the symbol for a voltmeter
A
.
25
What happens when there are two lamps in a series?
When there are two lamps for example in a series, the total energy carried by the current has been shared between the two lamps
26
How do you place a voltemter to measure voltage/potential differnce in a circuit?
Across the component
27
What happens to the potential difference in a series circuit?
In a series circuit, the potential difference is split between the components
28
What is the potential difference like in a parallel circuit?
The potential difference is a parallel circuit across each component is the same
29
What is a battery?
A battery is two or more cells connected together.
30
Draw the symbol for a battery
31
What do you do for potential difference in a battery?
Potential difference (voltage) is added together each time a cell is added
32
What is electrical charge measured in?
Coulombs (C)
33
What is a current of 1 ampere equal to?
A current of 1 ampere is equal to 1 coulomb of charge flowing per second
34
What is the size of electrical charge?current
The size of electrical current us the rate of flow of electrical charge
35
What is an electric current?
An electric current is a flow of electrons through a conductor such as a metal wire
36
What happens as electrons move through a metal?
As electrons move, the electrons collide with atoms in the metal. Electrical energy is transferred into other forms e.g. thermal.
37
What does resistance tell us?
Resistance tells us the potential difference required to drive a current through a component.
38
Draw the unit for resistance
Ohm..
39
What is the unit for resistance?
Ohm
40
What does higher resistance mean?
The higher the resistance the more energy is transferred as current moves.
41
What happens as electrons move through a conductor (metal etc)?
As the electrons move through a conductor, they collide with atoms in the metal. Electrical energy is transferred into other forms e.g. thermal.
42
Draw a symbol for a resistor?
.
43
What is the current move through a resistance proportional to?
The current moving through a resistor is directly proportional to the potential difference.
44
What is an ohmic conductor?
The resistance is constant, meaning it doesn't change if we increase the current, but the resistance will only stay constant if the temperature is constant.
45
What is the special rule about ohmic conductors?
The resistance will only stay constant if the temperature is constant.
46
Hoe do filament lamps emit light?
Through a very fine wire which gets extremely hot when an electric current flows through it producing light.
47
Why is the current through a filament lamp not directly proportional to the potential difference?
Because the filament get hots, causing the resistance to increase
48
How does resistance increase due to high temperature?
At high temperature, the atoms in the filament vibrate more - meaning the electrons in the current now collide with more atoms, and so more energy is needed to push the current through the filament.
49
What is an example of a thing that is not an ohmic conductor?
Filament lamp
50
Draw the shape of the graph for the resistance of a filament lamp
.
51
Draw the symbol for a diode?
.
52
What are diodes used for?
Diodes are useful for controlling the flow of current in circuits
53
Why does the current in a diode flow in one direction?
Because the diode has a very high resistance in the reverse direction
54
Draw the graph for the current potential difference of a diode?
.
55
Draw the symbol for an LED.
.
56
What does LED stand for?
Light-emitting diode
57
What do LEDs do when current flows through?
Gives off light
58
What is a similarity between a diode and an LED?
LEDs are just like normal diodes only allowing current to flow in the forward direction
59
Why is LED useful?
LEDs are an extremely energy-efficient source of light
60
Dray the symbol for a closed and open switch
.
61
Dray the symbol for a cell
.
62
Draw the symbol for a battery
.
63
Draw the symbol for a diode
.
64
Draw the symbol for a resistor
.
65
Draw the symbol for a variable resistor
.
66
Draw the symbol for a LED
67
Draw the symbol for a lamp
68
Draw the symbol for a fuse
.
69
Draw the symbol for a voltmeter
70
Draw the symbol for a ammeter
71
Draw the symbol for a thermistor
72
Draw the symbol for an LDR
73
What must a circuit include for an electrical charge to flow through a closed circuit?
A source of potential difference
74
What is electric current?
Electric current is a flow of electrical charge
75
What is the size of electric current?
Is the rate of flow of electrical charge
76
What is the equation that links charge flow, current and time?
Q = I t
77
What is special about the current is a single closed loop?
A current has the same value at any point in a single closed loop
78
What does the current through a component depend on?
Depends on the resistance of the component and the potential difference
79
What does it mean for the current if the resistance of a component gets greater?
The greater the resistance of the component the smaller the current for a given potential difference across the component
80
What is otential diffrenece the same as?
Voltage
81
What equation can be used to calculate the current, potential difference or resistance?
V = I R
potential difference = current x resistance
82
What is the unit for current?
Amperes/ amps
83
How does the resistance of a thermistor vary based on its conditions?
The resistance of a thermistor decreases as the temperature increase
84
How does the resistance of an LDR vary based on its conditions?
The resistance of an LDR decreases as light intensity increases
85
What is one application of a thermistor in a circuit?
Thermostat
86
What is one application of an LDR in a circuit?
The application of LDRs in circuits eg switching lights on when it is dark
87
WHat are the two ways of joining circuits?
Series and Parallel
88
What are the characteristics of the current in a series circuit?
There is the same current through each component
89
What are the characteristics of the potential difference in a series circuit?
The total potential difference of the power supply is shared between the components
90
What are the characteristics of the resistance in a series circuit?
The total resistance of two components is the sum of the resistance of each component
91
What is the unit for resiatnce?
ohms
92
DRaw ohms
93
What are the characteristics of the current in a parallel circuit?
The total current through the whole circuit is the sum of the current through the separate components
94
What are the characteristics of the potential difference in a parallel circuit?
The potential difference across each component is the same
95
What are the characteristics of the resistance in a parallel circuit?
The total resistance of two resistors is less than the resistance of the smallest individual resistor
96
What is the frequency and voltage of domestic electricity supply in the UK?
50hz, 230V
97
What type of supply is the mains electricity?
AC supply
98
What are everyday electrical appliances designed to do?
Are designed to bring about energy transfers
99
What does the amount of energy an appliance transferes depend on?
The amount of energy an appliamnce transfers depends on how long the apliance is switched on for and the power of the appliance.
100
When is work done?
Work is done when a charge flows in a circuit
101
What equation is used to calculate the energyg transfered by electrical work?
Energy transfered = power x time E = P t
Energy transffered = charge flow x potential difference E = Q V
102
WHat is the unit for energy transffred?
Joules
103
What is the unit for power?
Watts
104
What is the unit for Charge flow
Q
105
Unit for coloums?
C
106
What is the National grid?
The National Grid is a system of cables and transformers linking power stations to consumers
107
How is electrical power transffered?
Electrical power is transfferred from power stations using the NAtional Gridr
108
Why are step up transformers used?
Step-up transformers are used to increase the potential difference from the power station to the transmission cables
109
Why are step down transformers used?
Step down transformers are used to decrease potential difference, to a much lower Value for domestic use
GCSE Physics
flashcards
Decks in class (14)
# Cards
-
Forces (P8, P9 & P10) & Equations15
-
Equations: Energy P1, P2 & P35
-
P1. Conservation & Dissipation Of Energy67
-
P2. Energy Transfer By Heating 👩🏼🦲7
-
P3. Energy Resources20
-
P4. Electrical Circuits109
-
P6. Molecules & Matter19
-
P7. Radioactivity76
-
P8. Forces In Balance22
-
P9. Motion25
-
P10. Forces & Motion1
-
P11. Wave Properties44
-
P12. EM Waves43
-
Scientific Terms4
