The object of this revision lesson is to put together a personal set of Revision Notes to help you prepare for your exam.

You may use Crocodile Technology or the Gartree Science webpages and search engines such as GOOGLE

Save work to your folder as you go along in case we have problems with printing or computer failure.

You may also find it useful to try the practice tests on revision sites.

By the end of this lesson you should have saved a set of revision notes based on the suggestions below - and printed them off if possible.

Key things to find and learn:

Circuit Symbols

Meanings:
Voltage
Current
Potential Difference
Resistance
Ohms

Explain the difference between these word pairs:

direct current
alternating current

ammeter
voltmeter

variable resistor
diode

LDR [light dependent diode]
thermistor

Try showing the following on Crocodile Technology
or Interactive Circuitboard! [Needs Shockwave]

Series Circuits - can you draw one?
Parallel circuits - and one of these?

Electric currents, magnetic fields and movement
Electromagnets
What affects their strength?
What happens when the current is reversed?
How does a dc motor work?
How does a circuit breaker work?

Explain the terms:
electrons
positive and negative charges
repulsion and attraction
Static is used by photocopiers and inkjet printers, but how?

Electrolysis. What is it?
In solids, electric current = flow of electrons
But what about ions in liquids? e.g. copper sulphate
Opposite charged particles are attracted to electrodes.
Simpler substances are released or deposited at electrodes.

Mains electricity
230v
How to wire a 3 pin plug.
What is a fuse?
What is a circuit breaker?
How do they work?
How do they compare?

When an electric charge flows through a resistor,
some electrical energy is transferred as heat.
1 watt is the transfer of 1 J [joule] of energy in 1 s [ second]

How does a generator work?
What happens if you move a magnet in a coil?
What is a transformer? How does it work?

2. LINKS

The three activities below were part of your practical investigations.
Look through your notes and remind yourself of what you did.
If you feel unsure, try them out on Crocodile Technology or Interactive Circuitboard

3. Draw a selection of electrical circuits, including:

switch
resistor
ammeter
voltmeter

Include one with 3 bulbs in series
and another with three bulbs in parallel.

4. Here are some things to investigate.
What happens to voltage as more and more bulbs are added in series?
What happens to the voltage if you swap over to parallel circults?
[instead of series] What happens to the current?
What is the relationship between current and resistance?

5. Research and put together notes on electromagnets,
and their use in electric motors, bells and buzzers.
Go on to research and make notes on static electricitiy,
What is it and how can you demonstrate it in action?