Month: February 2021

Ohm’s Law is one of the most important formulas in the electrical engineering world. It was formulated by a German Scientist, Georg Ohm, in the early 1800’s He was carrying out experiments with the new electrical cells invented by the Frenchman Voltaire. He discovered that there was a direct relationship between the voltage in a…

If you don’t know the resistor colour code then it may at first seem to be a black art, but it is actually very easy to learn and once you can use it correctly you will have a real skill for life. The method that we use at Learn Electrics is a much easier method…

Voltage Drop is a measure of how much voltage is lost in the cables between the consumer unit, the distribution board or some other reference point and the point of use. For example, we would like to know the Actual Voltage Drop in the shower cable from the house consumer unit to the shower unit,…

Many trades and occupations now ask that some of their employees are tested for colour blindness. This is particularly important in the electrical and electronic trades where many different colours are used to identify cables. Some training centres will test a new trainee’s ability to differentiate colours when they first begin their training. This can…

COLUMN NUMBERING NOTES When completing a Schedule of Test Results it is important that the correct data is entered into the correct boxes on the schedule. The Schedule of Test results will be used for comparison checks of the circuit in the future, for example at the next Periodic Inspection. It is imperative then that…