Chapter 2: Electricity
0.0(0)
Studied by 6 people
View linked note
Learn
Practice Test
Spaced Repetition
Match
FlashcardsCard Sorting
1/49
Study Analytics
Name | Mastery | Learn | Test | Matching | Spaced |
|---|
No study sessions yet.
50 Terms
1
New cards
Potential difference
________ is the driving force that pushes the charge round.
2
New cards
IR
Using V= ________, an increase in current means a decrease in the total resistance of the circuits.
3
New cards
negative ends
Alternating currents are produced by alternating voltages in which the positive and ________ keep alternating.
4
New cards
electrical charge
When a(n) ________ goes through a change in potential difference, then energy is transferred.
5
New cards
Resistance
________ is anything that slows the flow down.
6
New cards
Sparks
________ are caused when there is a high enough potential difference between a charged object and the earth.
7
New cards
strong electric field
The ________ causes electrons in the air particles to be removed.
8
New cards
Transformers
________ are nearly 100 % efficient, so the power in primary coil= power in secondary coil.
9
New cards
Ammeter
The ________: Measures the current flowing through the test wire.
10
New cards
national grid
The ________ uses a high pd and a low current.
11
New cards
material
The ________ that loses the electrons loses some negative charge, and is left with an equal positive charge.
12
New cards
mains supply
The live wire provides the alternating potential difference (about 230V) from the ________.
13
New cards
Electricity
________ is distributed via the Nation Grid.
14
New cards
Energy
________ is supplied to the charge at the power source to ‘ raise it through a potential.
15
New cards
LDR
A(n) ________ is a resistor that is dependent on the intensity of light.
16
New cards
Thermistors
________ make useful temperature detectors, temperature sensors and electronic thermostats.
17
New cards
Parallel Circuits
In ________, each components is separately connected to the +ve and- ve of the supply, except ammeters, which are always connected in series.
18
New cards
certain insulating materials
When ________ are rubbed together, negatively charged electrons will be scraped off one and dumped on the other.
19
New cards
maximum safety
Appliances are often given a power rating- theyre labelled with the ________ power that they can operate at.
20
New cards
Electric field lines
________ go from positive to negative.
21
New cards
Electrical Appliances
________ are designed to transfer energy to components in the circuit when a current flows.
22
New cards
neutral wire
The ________ completes the circuit- when the appliance is operating normally, current flows through the live and ________, at 0V.
23
New cards
Ohmic conductors
________ have a constant resistance.
24
New cards
electric fields
Sparking can be explained by ________.
25
New cards
UK mains supply
The ________ is an ac supply at around 50Hz.
26
New cards
Transformers all
________ have two coils, a primary coil and a secondary coil joined with an iron coil.
27
New cards
V Characteristics
The term I- ________ refers to a graph which shows how the current flowing through a component changes as the potential difference across it is increased.
28
New cards
Non linear components
________ have a curved I- V characteristic.
29
New cards
total energy
The ________ transferred by an appliance depends on how long the appliance is on for and its power.
30
New cards
series circuit
In a(n) ________, the current is the same everywhere so the total current in the circuit is reduced when a resistor is added.
31
New cards
ac supplies
In ________ the current is constantly changing direction.
32
New cards
Potential difference
________ is increased using a step- up transformer.
33
New cards
electrical charge
When a(n) ________ flows through a filament lamp, it transfers some energy to the thermal energy store of the filament which is designed to heat up.
34
New cards
Energy
________ is Transferred from Cells to other Sources.
35
New cards
parallel circuits
In ________ the total current flowing around the circuit is equal to the total of all the currents through the separate components.
36
New cards
Potential difference
________ is changed by a transformer.
37
New cards
potential difference
The ________ across each resistor is lower, so the current through each resistor is also lower.
38
New cards
Potential Difference
Power also depends on Current and ________.
39
New cards
Unit
ohm
40
New cards
Formula
Q=It
41
New cards
The Ammeter
Measures the current flowing through the test wire
42
New cards
The Voltmeter
Measures the potential difference across the test wire
43
New cards
The calculate the resistance you can do
R=V/I
44
New cards
In series circuits the same current flows through all components
R(total) = R1 + R2
45
New cards
There are two types of electricity supplies
alternating current(ac) and direct current(dc)
46
New cards
Only electrons move
never positive charges
47
New cards
LDR
Light dependent resistor
48
New cards
Live wire
Provides the alternating potential difference
49
New cards
Earth wire
For protecting the wiring and safety
50
New cards
Neutral wire
Completes the circuit, at 0V