Electrical Apprenticeships
Electrical Apprenticeships
How electricity is generated in a conventional power station
Why electricity is transmitted at high voltages
The advantages of balancing loads across the three lines
Work out phase and line voltages and currents in a Star-connected system
Work out phase and line voltages and currents in a Delta-connected system
Determine the line current in a 3-phase RL circuit
Draw TN-S and TN-C-S earthing systems
Auto, double-wound and current transformers
Determine the capacitive reactance in an AC circuit
Determine the capacitive reactance in an AC circuit
Question using inverse square law to calculate illuminance
Question using cosine law to calculate illuminance
Disconnection times using the current-time curves as found in appendix 3 of BS7671
Edit a drawing to show additional start and stop buttons
Two basic drawings for two types of DC motor
A short video on Isolation transformers and how they can reduce the risk of shock.
Undervoltage protection - what it is and how it is afforded in a DOL starter.
Formula and something to watch out for.
The formula
The formula
2 short examples
Determine the percentage slip - the difference between synchronous speed and rotor speed.
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