Studied by 6 peoplePotential difference
________ is the driving force that pushes the charge round.
IR
Using V= ________, an increase in current means a decrease in the total resistance of the circuits.
negative ends
Alternating currents are produced by alternating voltages in which the positive and ________ keep alternating.
electrical charge
When a(n) ________ goes through a change in potential difference, then energy is transferred.
Resistance
________ is anything that slows the flow down.
Sparks
________ are caused when there is a high enough potential difference between a charged object and the earth.
strong electric field
The ________ causes electrons in the air particles to be removed.
Transformers
________ are nearly 100 % efficient, so the power in primary coil= power in secondary coil.
Ammeter
The ________: Measures the current flowing through the test wire.
national grid
The ________ uses a high pd and a low current.
material
The ________ that loses the electrons loses some negative charge, and is left with an equal positive charge.
mains supply
The live wire provides the alternating potential difference (about 230V) from the ________.
Electricity
________ is distributed via the Nation Grid.
Energy
________ is supplied to the charge at the power source to ‘ raise it through a potential.
LDR
A(n) ________ is a resistor that is dependent on the intensity of light.
Thermistors
________ make useful temperature detectors, temperature sensors and electronic thermostats.
Parallel Circuits
In ________, each components is separately connected to the +ve and- ve of the supply, except ammeters, which are always connected in series.
certain insulating materials
When ________ are rubbed together, negatively charged electrons will be scraped off one and dumped on the other.
maximum safety
Appliances are often given a power rating- theyre labelled with the ________ power that they can operate at.
Electric field lines
________ go from positive to negative.
Electrical Appliances
________ are designed to transfer energy to components in the circuit when a current flows.
neutral wire
The ________ completes the circuit- when the appliance is operating normally, current flows through the live and ________, at 0V.
Ohmic conductors
________ have a constant resistance.
electric fields
Sparking can be explained by ________.
UK mains supply
The ________ is an ac supply at around 50Hz.
Transformers all
________ have two coils, a primary coil and a secondary coil joined with an iron coil.
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.
Non linear components
________ have a curved I- V characteristic.
total energy
The ________ transferred by an appliance depends on how long the appliance is on for and its power.
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.
ac supplies
In ________ the current is constantly changing direction.
Potential difference
________ is increased using a step- up transformer.
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.
Energy
________ is Transferred from Cells to other Sources.
parallel circuits
In ________ the total current flowing around the circuit is equal to the total of all the currents through the separate components.
Potential difference
________ is changed by a transformer.
potential difference
The ________ across each resistor is lower, so the current through each resistor is also lower.
Potential Difference
Power also depends on Current and ________.
Unit
ohm
Formula
Q=It
The Ammeter
Measures the current flowing through the test wire
The Voltmeter
Measures the potential difference across the test wire
The calculate the resistance you can do
R=V/I
In series circuits the same current flows through all components
R(total) = R1 + R2
There are two types of electricity supplies
alternating current(ac) and direct current(dc)
Only electrons move
never positive charges
LDR
Light dependent resistor
Live wire
Provides the alternating potential difference
Earth wire
For protecting the wiring and safety
Neutral wire
Completes the circuit, at 0V
Note
Flashcard