Circuit Diagrams 2
• Introduction

Convential symbols are used to show different components which are standard across the electrical industry. This makes it quick and easy to construct circuit diagrams - certainly a lot quicker than drawing a picture of it! It also makes it easier to construct real circuits from the drawings.

In this worksheet we'll try working out circuit diagrams from descriptions of circuits, and drawings of them, and we'll also try SERIES and PARALLEL circuits. Series circuits have all the components in a single loop so the same current goes through everything:

Parallel circuits have different branches which means that different components can be on each branch and so can be controlled individually:

• Question 1

Match the symbol to what it represents:

## Column B

W
cell
X
bulb
Y
buzzer
Z
motor
• Question 2

In this circuit what happens when the switch is closed?

bulb turns on

motor turns on

both turn on

• Question 3

In this circuit what happens when the switch is closed?

bulb turns on

motor turns on

both turn on

• Question 4

In this circuit what happens when the switch is closed?

bulb turns on

motor turns on

both turn on

• Question 5

Look at this circuit carefully:

Which one of the following descriptions of how the circuit works is correct?

when switch S1 is closed the buzzer sounds

when switch S2 is closed the bulb lights

when switch S1 is closed the bulb lights

when switch S2 is closed the buzzer sounds

when both switches are closed both the buzzer and the bulb turn on

when both switches are closed the buzzer sounds but the bulb is off

when both switches are closed the bulb lights but the buzzer is off

• Question 6

Here are four circuits:

Tick each of the bulbs that you think will be ON.

A

B

C

D

E

F

G

H

• Question 7

Here are three circuits with switches:

Tick which bulbs are on when the switches are open (as drawn).

A

B

C

D

E

F

• Question 8

Here are the same three circuits:

Imagine that the switches in all the circuits have been closed.

Tick which bulbs are on now that the switches have been closed.

A

B

C

D

E

F

• Question 9

Here is a description of an electric circuit:

"The circuit has two cells, two switches and two bulbs. When one switch is closed one bulb goes on and when both the switches are closed both the bulbs are on."

Which of these three circuits correctly matches the description of how this circuit works?

A

B

C

• Question 10

Here is a description of another electric circuit:

"The circuit has two cells, two switches, one bulb and a motor. When one switch is closed the bulb goes on and the motor turns. When both switches are closed the motor continues to spin but the bulb goes out."

Which of these three circuits correctly matches the description of how the circuit works?

A

B

C

Progress