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Five Top Tips For Fault-Finding - Tip 5

By Damien Coleman

You should rely on your knowledge of fundamental electrical principles when fault-finding an electronic sub-system.

Below is a list of the most common physical laws which can be used on a daily basis to assist with accurate repairs in a timely and productive manner:

  • The electric current in a circuit is proportional to the applied voltage and inversely proportional to the circuit resistance
  • The sum of the voltage drops in a series circuit is equal to the applied voltage
  • When an EMF is generated by a change in magnetic field, an induced voltage of opposite polarity is set up which opposes the direction of the applied change which produced it
  • Like charges repel and unlike charges attract, which is directly proportional to the product of the charges and inversely proportional to the square of the distance between them

Click on the doors below to read our other top tips.