Basic Electrical Practise workshop with Dennis Flynn


Today’s workshop was Basic Electrical Practise, where my workshop tech was Dennis Flynn, who started off the session with explaining where electricity comes from.
Electricity is sourced from power stations. These types are:

AC (Alternated Current)

Power stations produce steam that are transferred through a turbine, that flows into a generator at 300V. AC is used instead of DC because it can be transformed down to 11ku -> 415,00V. All sockets and lights in a person’s home is 230V per house.

DC (Direct Current)

90% of devices (e.g mobile phones) use DC. DC has a +VE as well as -VE like the plus and minus on the battery terminals. I didn’t catch the name of what these terminals are professionally called but they are used practically in every day life.

LED (Light Emitting Diodes)

Each LED battery is 1.5V. Two batteries are connected in ‘series’. They are both linked positive to negative so there would be a total of 3 volts. Car batteries would be 20x 12V = 400V equivalent together.

Parallel Connections

3 Series = one cell. It is hard to explain in just text as Dennis used a lot of technical symbols to explain the parallel connections but my doodles aren’t the most accurate and I do not feel like putting up a lot of notebook scribbles on this blog. But I definitely grasped my head more around Parallel connections.


Resistors are multiplied by 10. Each colour on one is a different value. There are always four different coloured rings around a resistor. The colours are:
-Black = 0
-Brown = 1
-Red = 2
-Orange = 3
-Yellow = 4
-Green = 5
-Blue = 6
-Violet = 7
-Grey = 8
-White = 9

Each colour is a value and the values can go up to 10 million ohm’s. Resistors can be connected in one or two ways, which was again described by symbols.

Prototype Board

Advanced Solderless Breadboard Prototyping & Testing for Electronic or Computer Circuits. When setting up a prototype board, if your voltage is more than 3, it will blow your LED light, which will never work again as it will be fried. LED lights predominantly are used at 2V.

Despite the horrific Mathematics and Physics behind this workshop, I did enjoy having something a bit more challenging that I had to get my head around so I was happy when I got to set up the Prototype Board and eventually, though, last in my group, to get my LED light to come on. I was very happy and would recommend this workshop for anyone who wants to learn the basic understanding of how electricity powers nearly everything we use in our day to day lives. The only thing I am a little disappointed with, with this workshop was how little we actually got to play with setting up electrical things. Maybe if the workshop ran longer, we could’ve had more opportunity to set up different but simple electrical practises like the LED light on the prototype board.


Author: lawrenceaaronmaker

Studying a BA Hons in Artist, Designer; Maker at Cardiff Metropolitan University.

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