# Electrical Circuits

In this worksheet, students will follow an introduction to electrical circuits.

Key stage:  KS 3

Curriculum topic:   Physics: Electricity and Electromagnetism

Curriculum subtopic:   Current Electricity

Difficulty level:

### QUESTION 1 of 10

There are two types of circuits: a series and a parallel circuit. Diagram 1 shows a simple series circuit with drawings of the components, while diagram 2 shows a series circuit with two light bulbs as a circuit diagram.

Parallel circuits look a bit more complicated than series ones, as you can see in diagram 3. Here is a parallel circuit with two light bulbs.

 Diagram 1 Diagram 2 Diagram 3

Light bulbs are symbolised as circles with a cross, as shown in diagrams 2 and 3.

Some books or Internet resources use another symbol for light bulbs (see diagram 4).

 Diagram 4

Here are some other electrical circuit symbols (diagram 5):

 Diagram 5

Wires are simply represented as lines.

In a series circuit, all light bulbs light together and if one breaks, a gap is created in the circuit, so none of them works. In a parallel circuit, the current flows along all branches. If one light bulb is broken, the others can still work. Christmas lights are connected in parallel. No one wants their Christmas lights off, because of just one bulb!

In a series circuit, adding more bulbs would make all of them dimmer, because this would increase the resistance in the circuit. In a parallel circuit, though, if you add more branches with bulbs in them, they will all still be bright.

Current is the same everywhere in a series circuit, but it splits up in branches in a parallel circuit. In the latter, current in all branches adds up to the current in the main branch.

What is the main symbol for a light bulb in a circuit diagram?

a circle with an A inside it

a circle with a V inside it

a circle with an X inside it

Is this statement true or false?

A series circuit has only one loop.

true

false

What is the symbol for an ammeter?

a circle with an A inside it

a circle with a V inside it

a circle with an X inside it

Fill out the gap in this sentence.

In electrical circuits wires are represented as _____________ .

circles

lines

What happens in a series circuit when one light bulb breaks?

the others still work

the others stop working

What connection is used for Christmas lights?

series

parallel

How can you make light bulbs brighter in a series circuit?

take away some light bulbs

Is this statement true or false?

In a parallel circuit the current is the same around the circuit.

true

false

Is this statement true or false?

In a series circuit the current is the same everywhere in the circuit.

true

false

Is this statement true or false?

To symbolise three cells in an electrical circuit, you need to draw two cells next to each other.

true

false

• Question 1

What is the main symbol for a light bulb in a circuit diagram?

a circle with an X inside it
EDDIE SAYS
The main symbol for a light bulb is a circle with an X inside it.
• Question 2

Is this statement true or false?

A series circuit has only one loop.

true
EDDIE SAYS
The statement is true. Series circuits are made of only one loop.
• Question 3

What is the symbol for an ammeter?

a circle with an A inside it
EDDIE SAYS
An ammeter is symbolised as a circle with an A inside it.
• Question 4

Fill out the gap in this sentence.

In electrical circuits wires are represented as _____________ .

lines
EDDIE SAYS
In electrical circuits wires are represented as lines.
• Question 5

What happens in a series circuit when one light bulb breaks?

the others stop working
EDDIE SAYS
When a light bulb breaks in a series circuit, the others stop working.
• Question 6

What connection is used for Christmas lights?

parallel
EDDIE SAYS
Christmas lights are connected in parallel.
• Question 7

How can you make light bulbs brighter in a series circuit?

take away some light bulbs
EDDIE SAYS
If you take away some light bulbs in a series circuit, the others become brighter.
• Question 8

Is this statement true or false?

In a parallel circuit the current is the same around the circuit.

false
EDDIE SAYS
This is false. In a parallel circuit the current splits into the branches.
• Question 9

Is this statement true or false?

In a series circuit the current is the same everywhere in the circuit.

true
EDDIE SAYS
This is true. In a series circuit the current is the same everywhere in the circuit.
• Question 10

Is this statement true or false?

To symbolise three cells in an electrical circuit, you need to draw two cells next to each other.

false
EDDIE SAYS
This is false. To symbolise three cells in an electrical circuit, you need to draw three cells next to each other.
---- OR ----

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