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Series Electric Circuits

In this worksheet, students will be asked to decide if a circuit is complete.

'Series Electric Circuits ' worksheet

Key stage:  KS 2

Curriculum topic:  Electricity

Curriculum subtopic:  Switches

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

In this worksheet you must decide whether a circuit will work. For example, whether it will light a bulb or make a fan work.

 

Light bulb

 

Check whether a circuit is complete and whether the current can get round it.

The picture shows a circuit containing a battery of two cells, a push switch (14) and a bulb (18).

 

How bright will the bulb be if the switch is pushed?

 

Circuit board

bulb will be bright

bulb will be normal brightness

bulb will be dim

bulb will not light

This circuit has two cells in its battery.

 

If one of the cells is taken out and is replaced by a piece of wire, and the push switch is closed then the bulb will be...

 

Circuit board

dimly lit

brightly lit

normally lit

not lit at all

Look at this circuit.

 

If a second battery pack is put into the circuit, and the push switch is pushed, show whether the bulb will be lit or not (there are TWO correct answers).

 

Circuit board

dimly lit

very brightly lit

normally lit

not lit

Circuit board

 

Here is a picture of a fan in a circuit with a slide switch.

 

The fan might go round slowly, fast, very fast or not at all when the switch is pushed. Which answer is true for this circuit?

normal speed

fast

slowly

not at all

In this question the circuit has a bulb and a reed switch.

 

What do you need to do to make the reed switch work?

 

Circuit board

bring a magnet up to the switch

touch the reed switch with your finger

cover the reed switch up

Look at this circuit.

 

Why does the bulb now come on?

 

Circuit board

the cells have been put in the right way round

the reed switch has been covered with a magnet

the light bulb is working

  • Question 1

The picture shows a circuit containing a battery of two cells, a push switch (14) and a bulb (18).

 

How bright will the bulb be if the switch is pushed?

 

Circuit board

CORRECT ANSWER
bulb will be normal brightness
EDDIE SAYS
A battery of two cells will light this bulb normally.
  • Question 2

This circuit has two cells in its battery.

 

If one of the cells is taken out and is replaced by a piece of wire, and the push switch is closed then the bulb will be...

 

Circuit board

CORRECT ANSWER
dimly lit
EDDIE SAYS
A single cell only has half the power of two cells. If the bulb was normally lit with two cells, then it will only glow dimly with one.
  • Question 3

Look at this circuit.

 

If a second battery pack is put into the circuit, and the push switch is pushed, show whether the bulb will be lit or not (there are TWO correct answers).

 

Circuit board

CORRECT ANSWER
very brightly lit
not lit
EDDIE SAYS
If the bulb is lit, then it will be very bright. It may be out, because the amount of electricity was too much for the bulb and it burned it out.
  • Question 4

Circuit board

 

Here is a picture of a fan in a circuit with a slide switch.

 

The fan might go round slowly, fast, very fast or not at all when the switch is pushed. Which answer is true for this circuit?

CORRECT ANSWER
normal speed
EDDIE SAYS
The fan is designed to go at normal speed when it is powered by two cells.
  • Question 5

In this question the circuit has a bulb and a reed switch.

 

What do you need to do to make the reed switch work?

 

Circuit board

CORRECT ANSWER
bring a magnet up to the switch
EDDIE SAYS
Reed switches are activated by a magnet - the magnet attracts the two contacts so that they touch together and close the switch. Reed switches are used in burglar alarms and in many other places where something needs to stay close to another thing to stay on or off. The light coming on when you open the fridge door is an example of this.
  • Question 6

Look at this circuit.

 

Why does the bulb now come on?

 

Circuit board

CORRECT ANSWER
the reed switch has been covered with a magnet
EDDIE SAYS
Now that there's a magnet by the reed switch, the contacts close and complete the circuit. As a result, the current flows and the bulb comes on.
---- OR ----

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