Flashcards in Current Electricity Deck (13):
Is needed for the current to flow , if there is a break in a circuit then the current won't flow ~> the electrical energy can't get though .
An electric current is caused by the flow of electrons through a good conductor such as metal
Symbol = I
Unit = ampere
Unit symbol = A
Measured using = Ammeter
Potential difference / voltage
Unit = Voltage
Unit symbol = V
Measured using = Voltmeter
Symbol = R
Unit = Ohm
Measured using = Ω
Measured using = Ohmmeter
Bulbs in series
If a bulb in series blows , none of them turn on .
The same amount of current flows through each bulb in the series .
The voltage is split up , depending on the size of the bulb .
Bulbs in parallel
The lights in your house are connected in parcelled , as are car head lights .
If the light in your bedroom blows , the kitchen light is unaffected .
The current is split between bulbs , if they are the same size the current is split evenly .
They are brighter because the same voltage flows through each bulb .
The mains supply (the electricity in our homes , supplied by ESB) is A.C
It flows at a potential difference of 230 volts .
A fuse is a safety device that prevents the circuit from overheating , it will melt when it is too hot , breaking the circuit
A circuit breaker is used in the fuse board of the home , and this trips , to stop the flow of current from entering the house .
The live wire is brown and carries most electricity it is connected to the plugs fuse on the right hand side
The neutral wire is blue and is connected to the left hand side