Electricity ((grade 3)

A material that allows electricity to pass through it

• conductor

• insulator

A material that does not allow electricity to pass through it

• conductor

• insulator

​ ​ ​ ​ ..... conducts electricity

• Distilled water

• Pure water

• Water from a river or the tap

• Living things like our body

All living things contain ​ (a)   . Our bodies are about ​ (b)   water. This water has ​ (c)   dissolved in it so it is not ​ (d)   --> Our bodies are ​ (e)  

• water
• 65%
• salt
• pure
• conductors

A ​ (a)   ​ is a unit to measure the strength of electricity. ​ (b)   describe the strength of a supply of electricity. ​ (c)   carry electricity in ​ (d)   (large wires) from where the electricity is made to where it is used in homes, factories and offices. The ​ (e)   of electricity carried by these cables is many thousands of volts.

• vol
• Voltage
• Pylon
• cables
• voltage

​ (a)   like microwave ovens, electric kettles and power drills use ​ (b)   . Mains electricity has a much ​ (c)   than cells. In some countries it is 110V and in other countries it is over 200V.

• Appliances
• mains electricity
• higher voltage

At these high voltages, safety is very ​ (a)   . The parts of an appliance that you touch must be made from ​ (b)   . The parts inside the appliances are made from ​ (c)   so that electricity can pass through. For example, metal is used for the píns in a ​ (d)   . The pins allow electricity to travel from the ​ (e)   , through the plug, and into an appliance such as a kettle or TV. When we handle the plug, we only touch the cover. This is made of plastic, which is a good insulator.

• important
• insulating material
• conducting material
• plug
• wall socket

If mains electricity flows through your body, you will get an ​ (a)   . ​ (b)   is one off the main causes off accidents with electricity. ​ (c)   often wears off the copper wires, so never place ​ (d)   under a carpet & never pull a plug. Be careful to plug too many ​ (e)   into the same socket. This can overload the socket and could give you a shock if you touch the socket or one off the plugs. It could also cause a fire.

• electric shock
• Damaged electrical wiring
• Plastic insulation
• an electric wire
• electrical devices

A ​ (a)   is a component in an electrical circuit. The switch turns ​the ​ (b)   on or off. To break the circuit, you broke ​ (c)   . A switch lets you turn a lamp on and off when you like, without having to break wires.

• switch
• electric current
• the wire

When we have 2 or more of cells connected together we call it a ​ (a)   . When the cell or battery is part of a circuit, ​ (b)   pushes electricity around the circuit.

• battery
• the stored energy