electricity and you recall that nerves carry electrical nerve impulses what happens to our bodies...

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Electricity and you • Recall that nerves carry electrical nerve impulses • What happens to our bodies when we get an electric shock • How can we use electric shocks.

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Page 1: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Electricity and you

• Recall that nerves carry electrical nerve impulses

• What happens to our bodies when we get an electric shock

• How can we use electric shocks.

Page 2: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Electricity and you

Our brains and nerves conduct electrical signals

through nerves.video

Page 3: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Electricity and youHeart muscles are controlled by electrical impulses so that they pump blood at the

correct time.If these signals do not reach all parts of

the heart Dr’s can fit a pacemaker

Page 4: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Electricity and youHeart muscles are controlled by electrical impulses so that they pump blood at the

correct time.If a heart stops beating or is beating

irregularly sometimes it can be made to start again by passing electricity through

it.

Page 5: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Electricity and youElectric shocks can. Look at

page 145 table D.

Page 6: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Electricity and youA shock from a 12V circuit and a 220V

mains

Voltage is _______________

1. Your body has a high resistance (higher resistance than a light

bulb) so you rarely feel anything if you touch a 12V circuit in a school

experiment.

2. As voltage increases so does current.

3. So a 220V electric shock from the mains circuit will cause

damage.

Voltage = current resistance

Page 7: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Electricity and youWhy no wet hands ?

The resistance of your skin is lower with wet hands, this would let a

higher circuit flow through you.

Are you telling the truth?

Page 8: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Revision before the task1. Learn key words

2. Draw circuit diagrams-look over summary sheets

3. Look at evaluating models.

Page 9: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

c any sensible answer, such as: it does not model resistance/there is no ‘wire’ for the children to move through/the children do not have to return to the banana stall

Page 10: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Page 11: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Series circuit – 2 bulbs

Series circuits – 2 bulbs

Page 12: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Parallel Circuit

Parallel Circuit

Page 13: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Set up the two circuits shown:

1. In which circuit are the bulbs the brightest?In circuit A the bulbs are the brightest.

2. What happens if you unscrew one bulb in Circuit A?The other bulb stays lit.

4. What happens if you unscrew a bulb in circuit B?The other bulb goes out.

3. What do we call circuit A?Parallel Circuit

5. What do we call circuit B?Series Circuit

A.B.

10:35

Page 14: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

Model circuits

Page 15: Electricity and you Recall that nerves carry electrical nerve impulses What happens to our bodies when we get an electric shock How can we use electric

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