Science Exam- Electricity Flashcards
What us static electricity?
We can get static electricity when we build up a charge (ie a balloon rubbed against hair, shoes on carpet) This can lead to a sudden discharge or electric shock as electrons move between the 2 substances
What is electricity?
A form of energy. It is the flow of charged particles
Electricity travels rapidly and can be converted into light, sound, heat and kinetic energy
Opposite and like charges
Opposite charges is when there is a proton and electron. Opposite charges attract each other
Like charges are a electron and electron or proton and proton. Like charges repel
Why do we have lightning rods
Because lightning always hit the highest point. This is because it is the least distance to travel and tries to find the easiest way down to the ground
What are conducters?
It allows electricity to flow through them
For example- Copper, metals, graphite
What are insulators?
They don’t allow electricity to flow through them
Eg- Plastic, wood, rubber, concrete
What is a semi-conductor?
Allows electricity to flow but only in certain conditions
What is current?
The amount of charge passing a point in a certain amount of time
We can say current flows from +ve to -ve terminal f the battery but it is actually the other way around
What do we measure current with?
We use an ammeter
It is measured in amps, it goes in series
Symbol: I
What is voltage?
The symbol for voltage is V (volts)
It is the amount of push around the circuit or through a component
It is measure by a voltmeter, it goes in parallel
What is resistance?
Its how hard it is for charge to flow
Symbol: R
Measured in Ohms, the greek letter omega
We use: V=IR
What is series and parallel?
Series: When two components are in the same electric current without interruption
Parallel: When two components are in different electric current with interruption
What does conducting electricity need?
Conducting pathway
A energy supplier
A energy user
Magnets
It has two charges / poles- North and south
Opposite poles attract
Like poles repel
Magnetic fields go N to S and never cross
