# Electricity PracticalPage 2

#### WATCH ALL SLIDES

5. A cleaned mirror will be dusty within

24hrs because

6. A woolen jersey could be attracted to a nylon shirt because

they have the same charge

the charge attracts dust

they would have opposite charges which would attract

Slide 12

Topic 7 page 10

A Van de Graff generator

a) Your hair stands on end when you

touch a Van de Graff generator

because

b) Your hair goes down when you touch a

water tap because

builds up and stores a negative charge

your hairs become negatively charged and repel each other

the negative charges leave you flowing along the pipes to the ground and the hairs stop repelling

Slide 13

Topic 7 page 11

Now fill the blanks

When a flows, charges are

current

moving

Slide 14

Topic 7 page 12

Battery

Ammeter

Bulb

Switch

Slide 15

Topic 7 page 13

Part of circuit Statement

Battery measures current

Bulb pushes the current

Switch changes electrical energy to light

Ammeter carries current round circuit

Connecting wire turns the current on and off

Slide 16

The a bulb the bigger the

Topic 7 page 14

Dim bulb Bright bulb

– small current - large current

brighter

current

Slide 17

Topic 7 page 14

a) An electric circuit

b) A complete circuit has

5. A B C D

is a path that electricity can flow along

no gaps allowing electricity to flow along it

0.2A

0.5A

0.65A

0.95A

Slide 18

Topic 7 page 15

A.

Slide 19

Topic 7 page 15

B.

Slide 20

Topic 7 page 15

C.

Slide 21

2a)The battery

b) The wires

c) The ammeter

d) The switch

3a) The energy change in the bulb is

b) The energy change in the battery is

4a) Electricians use symbols to

Topic 7 page 17

pushes the current through the wires

conduct the electricity

measures the current

opens and closes a gap

Electrical energy  Light energy

Chemical energy  Electrical energy

make their diagrams clearer and tidier

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