For any help email me at cpugh5345@yahoo.co.uk

1. 23/09/15
Electrical CircuitsElectrical Circuits

2. 23/09/15
Drawing CircuitsDrawing Circuits
1) A cell, a bulb and
a switch “in series”
2) A battery
of cells, a
switch and two
bulbs in series

3. 23/09/15
Measuring electric currentMeasuring electric current
We can measure the amount of electric current flowing
through a circuit using a device called an “ammeter”.
A

4. 23/09/15
Current in a series circuitCurrent in a series circuit
If the current
here is 2
amps…
The
current
here will
be…
The current
here will
be…
And the
current
here will
be…
In other words, the current in a series
circuit is THE SAME at any point

5. 23/09/15
Changing the currentChanging the current
If a battery is
added the current
will ________
because there is a
greater _____ on
the electrons
If a bulb is added
the current will
_______ because
there is greater
________ in the
circuit

6. 23/09/15
Parallel circuitsParallel circuits
A parallel circuit is one where the current has a “choice of
routes”:

7. 23/09/15
Current in a parallel circuitCurrent in a parallel circuit
A PARALLEL circuit is one where the current has a “choice
of routes”
Here comes the current…
And the rest will
go down here…
Half of the current
will go down here
(assuming the bulbs
are the same)…

8. 23/09/15
Current in a parallel circuitCurrent in a parallel circuit
If the
current
here is 6
amps
The current
here will be…
The current
here will be…
The current
here will be…
And the
current here
will be…

9. 23/09/15
Advantages of parallel circuits…Advantages of parallel circuits…
There are two main reasons why parallel circuits are used
more commonly than series circuits:
1) Extra appliances (like bulbs) can be added without
affecting the output of the others
2) If one appliance breaks it won’t affect the others
either

10. 23/09/15
FusesFuses
Fuses are _______ devices. If
there is a fault in an appliance
which causes the ____ and
neutral (or earth) wire to cross
then a ______ current will flow
through the _____ and cause it
to _____. This will break the
_______ and protect the
appliance and user from further
_____.
Words – large, harm, safety, melt, live, circuit, fuse