Electricity Practical

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Slide 22

0.2

Topic 7 page 18

X

A

A

Y

Z

0.2

0.2

0.2

0.2

0.2

In a series circuit the current is the at all points in the circuit.

same

Slide 23

0.2

Topic 7 page 19

X

Y

Z

0.2

0.4

0.2

0.2

0.4

In a parallel circuit the current taken from the battery the sum of the currents through the two bulbs

equals

Slide 24

Topic 7 page 20

Q1. The two bulbs in circuit B make less light than the one bulb in circuit A because

Q2. No current flows in circuit C because Q3.

Q4. House lights are better wired in parallel than series; a) b)

B shares the current between two (dim) bulbs

one of the bulbs is blown creating a break in the circuit

don’t dim

Broken bulb doesn’t put whole house into darkness

Slide 25

Using Voltmeters and Ammeters

Voltmeter – connected in parallel

Ammeter connected in series

Slide 26

Correctly Wired?

No! The voltmeter has been connected in series – it should be parallel

Slide 27

Correctly Wired?

No the Ammeter has been connected in parallel – it should have been series

Slide 28

Correctly Wired?

Yes! This Ammeter has been connected correctly in series

Slide 29

Correctly Wired?

Yes! This Ammeter has been connected correctly in series

Slide 30

Correctly Wired?

Yes! The Voltmeter has been connected correctly in parallel

Slide 31

Correctly Wired?

Yes! The Ammeter has been connected correctly in series

Slide 32

Effects of Series?

As more bulbs are added in series the bulbs grow dimmer

Slide 33

Topic 7 page 23

Circuit Diagram

Iron

Brass

Copper

Steel

Graphite

Plastic

Rubber

Perspex

Glass

Wood

Slide 34

Topic 7 page 25