Current Electricity

Question 1

Closed circuit

Answer 1

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 .

Question 2

Current electricity

Answer 2

An electric current is caused by the flow of electrons through a good conductor such as metal

Question 3

Current

Answer 3

Symbol = I
Unit = ampere
Unit symbol = A
Measured using = Ammeter

Question 4

Potential difference / voltage

Answer 4

Symbol =V
Unit = Voltage
Unit symbol = V
Measured using = Voltmeter

Question 5

Resistance

Answer 5

Symbol = R
Unit = Ohm
Measured using = Ω
Measured using = Ohmmeter

Question 6

Bulbs in series

Answer 6

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 .

Question 7

Bulbs in parallel

Answer 7

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 .

Question 8

Mains supply

Answer 8

The mains supply (the electricity in our homes , supplied by ESB) is A.C
It flows at a potential difference of 230 volts .

Question 9

Fuses

Answer 9

A fuse is a safety device that prevents the circuit from overheating , it will melt when it is too hot , breaking the circuit

Question 10

Circuit breaker

Answer 10

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 .

Question 11

Live wire

Answer 11

The live wire is brown and carries most electricity it is connected to the plugs fuse on the right hand side

Question 12

Neutral wire

Answer 12

The neutral wire is blue and is connected to the left hand side

Question 13

Watt

Answer 13

Is the unit of electrical power