Lab A-1 What is a Circuit?

Part 1.

1 2 3 4

None

are

corre

ct

0% 0% 0%0%0%

How many different combinations of the battery, bulb and wire completed the circuit?

1. 12. 23. 34. 45. None are correct

1b

• Wires must touch opposite ends of the battery.

• One end of the wire must touch the end of the light bulb or the metal thread of the bulb

Explain why you think some arrangements work?

A 1a

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Which circuit below will light the bulb?

1. A and B

2. A and C

3. A and D

4. A B D

5. All will light

Part 2a b

The Switch works when the lever is down and touching the metal – this completes the circuit – CLOSED

OPEN – meansswitch is up.

Part 2.

Open

and

On

Open

and

Off

Clo

sed a

nd On

Clo

sed a

nd Off

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Is the switch open or closed?

Would the light be on or off?

1. Open and On2. Open and Off3. Closed and On4. Closed and Off

Part 3. a

Moto

r, sw

itch,

bat

tery

...

Bulb

, wire

, bat

tery

, s...

Bulb

, bat

tery

, switc

h,...

Moto

r, sw

itch

batte

ry,..

.

0% 0%0%0%

Identify each symbol correctly –

1. Motor, switch, battery, wire

2. Bulb, wire, battery, switch

3. Bulb, battery, switch, wire

4. Motor, switch battery, wire

Part 3

Yes N

o

0%0%

Example Diagram – Is it an Open circuit ?

1. Yes

2. No

Part 4

All

conne

ctio

ns a

re...

The

bulb is

not o

n

The

batte

ry is

sep

arat

...

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What does it mean to have a “closed circuit”?

1. All connections are complete

2. The bulb is not on

3. The battery is separate from the bulb

Which of the following did conduct electricity?

Pen cap

strin

g

Rubber band

Plastic s

traw

Paper clip

All conducte

d ...

17% 17% 17%17%17%17%1. Pen cap

2. string

3. Rubber band

4. Plastic straw

5. Paper clip

6. All conducted electricity

Part 5

Part 5

met

al

wat

er air

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Which of the following materials can electricity NOT travel through?

1. metal

2. water

3. air

What are conductors?

What are insulators?

material through which electric material through which electric current flows easily.current flows easily.

material through which electric material through which electric current cannot movecurrent cannot move

Lab A-2 Voltage and Current

Part 2

33% 33%33%

What is the voltage of 1 D-cell battery?

1. 1 amp

2. 1.5 volts

3. 1.5 coulombs

Part 2

33% 33%33%

What is the voltage of 2 D-cell batteries?

1. 2 amps

2. 3 volts

3. 2 coulombs

Part 2

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The DC current is measured in what unit?

1. coulomb

2. volts

3. amperes

Part 3a

33% 33%33%

When measuring point A and B the voltage readings were …

1. the same

2. Slightly less

3. Slightly more

Part 4a

33% 33%33%

How much current is flowing in the circuit when the bulb is lit?

1. .06 amps

2. 1.5 volts

3. 110 amps

Part 4c

50%50%

If you leave the meter connected but unscrew the bulb the bulb stays lit.

1. True

2. False

Lab A-3 Types of Circuits

Series and Parallel

Part 1. a/b

Yes

– b

ulbs

very

brig

ht

Yes

– b

ulbs

som

ewha.

..

No –

bulb

s ve

ry b

right

No –

bulb

s so

mew

hat..

.

0% 0%0%0%

Does the current have any choice about where to go? Brightness of bulbs?

What type of circuit is it?

1. Yes – bulbs very bright2. Yes – bulbs somewhat bright3. No – bulbs very bright4. No – bulbs somewhat bright

Series Circuit

Part 1. c

The

other

bulb

...

2.

The

other

...

50%50%Why?

What happens when you unscrew one of the bulbs?

Circuit is broken

1. The other bulb stays lit

2. The other bulb goes out

Part 2. a /b

Yes

– b

ulbs

very

brig

ht

Yes

– b

ulbs

som

ewha.

..

No –

bulb

s ve

ry b

right

No –

bulb

s so

mew

hat..

.

0% 0%0%0%

Does the current have any choice about where to go? Brightness of bulbs?

What type of circuit is it?

1. Yes – bulbs very bright2. Yes – bulbs somewhat bright3. No – bulbs very bright4. No – bulbs somewhat bright

Parallel Circuit

Part 2. c

The

other

bulb

...

The

other

bulb

...

50%50%Why?

What happens when you unscrew one bulb?

In a parallel circuit each bulb has its own path to the battery.

1. The other bulb stays lit

2. The other bulb goes out

Part 3. a

Par

alle

l

Ser

ies

0%0%

Why?

Which type of circuit has brighter light bulbs?

1. Parallel

2. Series

In a parallel circuit each bulb has its own path to the battery.

Part 3 b

• With parallel circuit …– Will provide a constant amount of energy to

each device no matter how many other devices are on

– Can turn devices on and off without affecting other devices

– If used a series circuit all appliances would have to be on or off.

Household wiring is a parallel circuit with each device on a separate branch of wiring. Advantages of this?

A-5 a Complete the Chart Below

Both on Both off #1 on / #2 off #1 off / #2 on

On Off Off Off

A-5 b

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Is this an AND or OR circuit?

1. AND

2. OR

3. Both

A-6 a Complete the Chart Below

Both on Both off #1 on / #2 off #1 off / #2 on

On Off On On

A-5 a

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An AND circuit is also known as ….

1. Series circuit

2. Parallel circuit

3. Both

A-6 a

0% 0%0%

Is this an AND or OR circuit?

1. AND

2. OR

3. Both

A-6 a

0% 0%0%

An OR circuit is also known as ….

1. Series circuit

2. Parallel circuit

3. Both

A-7

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A car will sound if a warning bell if you open the door and the lights are on. What type of circuit is this?

1. AND / Series circuit

2. OR / Parallel circuit

3. Both

Bell sounds only if door is open and lights are on.

A3-R

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Which is or are a series circuit?

1. A B

2. B C

3. B C D

4. All are series

A3-R

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Which of the following will be true?

A. Bulb A is brighter than b and cB. Bulb a is dimmer than b and cC. Bulbs b and c are equally brightD. Bulb a b and c are equally bright

1. A2. B3. C4. A and B5. A and C6. D