Electricity - Science
Revision cards for a science unit about electricity.
- Created by: Myu Inoue
- Created on: 12-04-11 14:47
Circuits/Currents/Switches/Live and Dangerous
Ammeter = Measures how much electricity is flowing around a circuit
amp (A) = The unit for current
cell = A source for electricity with a low 'energy'. Cells push electrons round a circuit
circuit = A complete loop that electricity flows around
component = Something in a circuit, like a bulb, switch or motor
conductor = A material that lets electricity flow through it
electric current = The flow of electricity around a circuit
insulator = A material that does not let electricity flow through it
power pack = A source of electricity with a low energy (low voltage)
Circuits/Currents/Switches/Live and Dangerous/Go w
mains (electricity) =Alternating current at 230 V provided to houses, shops, etc.
power pack = A source of electricity with a low energy (low voltage)
switch = Turns electricity on or off, by closing or opening a gap in a circuit
voltage = A way of saying how much energy is transferred by electricity
atom = The smallest part of an element
electric current = The flow of electrons around a circuit
electrical energy = The kind of energy carried by electricity
electron = Tiny particle that flows around a circuit
filament = Thin piece of wire inside a light bulb that glows when electricity is flowing through it
Go with the flow/Series and Parallel/Using electri
model = A scientific way of thinking about how things happen
resistance = A way of saying how difficult it is for electricity to flow through something
resistor = A component that makes it difficult for electricity to flow - resistors are used to control the size of a current in a circuit
variable resistor = A resistor that can be adjusted to change the amount of resistance it has
voltage = A way of saying how much energy is transferred by electricity
component = Something in a circuit, like a bulb, switch or motor
parallel circuit = A circuit with two or more wires running next to each other
series circuit = A circuit where there is only one loop of wire
fuse = A piece of wire that melts if too much electricity flows through it
Using electricity/Electricity and you
cable grip = Part of a plug that holds the cable, and stops the wires being pulled out of the pins
live wire = The brown wire in a cable or plug
neutral wire = The blue wire in a cable or plug
earth wire = The green and yellow wire in a cable or plug
electric shock = When electricity flows through the body
impulse = Electrical signal carried by a nerve cell
nerve = Carries messages around the body
Electrical circuits
-Electricity is a flow of electrons, and can flow through conductors (metals are good conductors of electricity) but not through insulators
-The current is the amount of electricity flowing in a circuit, the units for current are amps (A)
-Currents are measured using an ammeter
-The resistance of a circuit is a way of saying how easy or difficult it is for electricity to flow
-High resistance = Hard for electricity to flow = small current
-Low resistance = easy for electricity to flow = large current
-Circuits can be series or parallel circuits
Electricity and heat
-When electricity flows through a wire, the wire can get hot
-Hot wires are used in electric fires, irons and cookers
-A fuse is a thin piece of wire that melts if too much electricity flows through it, and it is used for safety
Electricity and your body:
-Electrical signals i your body travel along nerves, so if an electrical current passes through your body you may get an electric shock
-This could burn you, or stop your hearts or lungs working
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