Science and Principles Level 3
One of the hardest hurdles on to leap on your electrical course is the Science and Principles exam at Level 3. This page continues to build on the information covered at Levels 1 and 2 to help you prepare for exam success.
What is electricity?
This video will start you on your journey to understanding the most basic question an electrician must answer: What is electricity?
Videos are training aids for City and Guilds 5357, 2365 and EAL Diploma in Electrical Installation Levels 1, 2 and 3.
What are the basic components of a circuit?
Almost every circuit installed will have the components featured in this video and you'll need to be able to identify them. Watch the video to check your understanding.
Videos are training aids for City and Guilds 5357, 2365 and EAL Diploma in Electrical Installation Levels 1, 2 and 3.
How to calculate total resistance for a series circuit
How to calculate total resistance of more complex series circuits
Do the rules change as you start to add more and more resistors in series? Watch the video to find the answer.
Videos are training aids for City and Guilds 5357, 2365 and EAL Diploma in Electrical Installation Levels 1, 2 and 3.
How to calculate total resistance of a simple parallel circuit
An introduction to the slightly bewildering world of parallel circuits, will the total resistance behave in the way you expect? This video will explain the reasons why.
Videos are training aids for City and Guilds 5357, 2365 and EAL Diploma in Electrical Installation Levels 1, 2 and 3.
How to calculate total resistance of more complex parallel circuits
The rules for finding total resistance of a parallel circuit with two resistors of differing values are slightly more complex, watch this video for a simple method to calculate the resistance.
Videos are training aids for City and Guilds 5357, 2365 and EAL Diploma in Electrical Installation Levels 1, 2 and 3.
How to calculate total resistance of any parallel circuit
When more than two resistors of different values are connected in parallel the reciprocal method must be used. This video explains how to do it and how to enter it into your calculator.
Videos are training aids for City and Guilds 5357, 2365 and EAL Diploma in Electrical Installation Levels 1, 2 and 3.
How to change AC to DC using diodes
How does AC get turned into DC? This video will help you to understand the process.
Videos are training aids for City and Guilds 5357, 2365 and EAL Diploma in Electrical Installation Levels 1, 2 and 3.
How to smooth a rectified waveform
How do we convert our bumpy DC waveform into something approaching a more recognisable, smooth DC supply, find the answer in the video.
Videos are training aids for City and Guilds 5357, 2365 and EAL Diploma in Electrical Installation Levels 1, 2 and 3.
