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Robots and electric eels

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When the circuit is complete tiny particles move round the circuit. ... When we do experiments we use small batteries NOT mains electricity! 20 ... – PowerPoint PPT presentation

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Title: Robots and electric eels


1
Robots and electric eels
  • Electricity

2
A forest
3
trees
4
What can you see?
5
Do they stay still?
6
No !
7
Now a game ----
8
When the circuit is complete tiny particles move
round the circuit.
  • The particles are very, very,
  • very, very,
  • very, very,
  • very, very, very
  • tiny!

9
Drawing circuits
  • A battery
  • A lamp

10
The circuit you connected
There is a battery and a complete loop of
conducting material.
11
Which materials are good conductors?
12
Electricity makes us work
13
Electrophoridae
electric eel
14
OW !
15
Water conducts electricity
16
Skin is rough
17
Press
18
Wet skin
metal
Water increases contact area between skin and
metal
19
Safety
  • Never touch electric appliances or switches with
    wet hands!
  • If we get a shock we will not work properly any
    more!
  • When we do experiments we use small batteries NOT
    mains electricity!

20
No switches in a bathroom
X
21
Changes
22
Look at the lump on top of the lamp
  • When it goes dark the street lamp comes on.
  • Special materials are used which change from good
    conductors to poor conductors.
  • The materials are semi-conductors

23
Semi-conductors have lots of uses
24
LEDs
25
New traffic lights
26
What have we learned?
  • When a current flows, tiny particles move round
    the circuit.
  • Conductors allow a current to flow through them
  • Metals, carbon, water, - - - -
  • Insulators do not allow a current to flow through
    them
  • Wood, plastic, paper, - - - - -

27
Some materials can be conductors and insulators!
  • These are semi-conductors
  • They are very useful as
  • sensors - when changes occur they can switch
    things on or off
  • LEDs used in traffic lights
  • and lots and lots more uses ---

28
Electricity
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