Term 3
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Electricity is also called ____________.
Electrical energy
Machines and appliances need an _______ of energy before they can provide an ________ of energy.
Input… output
Electrical appliances need _________ to work.
Electricity
Give an example of output energy
Light, sound, heat or movement
Which of the following can NOT be changed into electricity: sunlight, water, coal, chemicals or sound
Sound
What changes the energy in chemicals into electricity
Electrochemical cells
How many cells is a battery made of?
One or more
What happens a torch is switched on?
The chemical energy in the cells is changed into electricity
In a torch, what changes the electricity into light energy?
The bulb
What are the two ends of the cell called?
The negative end and the positive end
What are the positive and negative ends sibolized as?
+ and -
The energy that makes a torch shine is stored in a _________.
Cell
The positive end of the battery must touch the __________ end of the next battery.
Negative
True or False: To make the torch work, the cells must be put in the right way.
True
Why do we need to dispose of old batteries?
Harmful chemicals leak out of old batteries
Why do we need to dispose of old batteries?
Harmful chemicals leak out of old batteries
What will happen if you put batteries in a fire?
They will explode
True or False: If part of the electrical circuit is broken, the appliance runs on it’s backup energy stored inside it.
False. If part of the electrical circuit is broken, the appliance will stop
What is the symbol for a battery?
In a circuit the battery is shown as two lines next to each other. The one on the left is longer
What is the symbol for a bulb?
In a circuit the bulb is shown as a circle with an x inside of it
What is the symbol for a switch?
In a circuit the switch is shown as either two dots with a line connecting them ( if it’s closed) or two dots with a line leading diagonally down from the one
What is the order of the buildings in a national grid?
Power station, step-up transformers, pylon, step-down transformers and finally the consumers.