Electricity Flashcards
Polythene rod
Gains electrons if a woollen cloth is rubbed on it
Earthing
Occurs when a charged object looses its charge to the earth through a conductor
Static Electricity
Is a build up of electric charge that can occur on good insulators
Electric Current
Is a flow of electric charge (electrons)
Conductors
Are substances which allow electric current to flow through them freely
Insulators
Are substances which do not allow electric current to flow through them
A closed circuit
A closed circuit is needed for the current to flow if there’s a break in a circuit then the current the current won’t flow
Energy provided
Energy is provided by a battery or power pack, it is needed to move the current around the circuit
The battery pumps electrons
The battery pumps electrons from its negative end around the circuit
The electrons are attracted
The electrons are attracted back to the positive end of the battery
Potential difference
The difference in electrical pressure between the positive and negative ends of a battery or power pack
Whenever there is a potential difference
Electricity will flow
This potential difference is known as
Voltage and is measured in volts
Resistance
Resistance is the opposition to the flow of electrons. The unit is the Ohm and it is measured using an ohmmeter
If a resistor is placed in an electric circuit
It will slow down the flow of electrons
