Scenario: City of Westminster College:
Electrical circuits consist mainly of series/parallel combinations using common components, irrespective of complexity these networks can be reduced to aid in solving current flow and/or voltages developed.
The majority of this assignment looks at different techniques and how they are used in solving networks.
a) Below is a series/parallel combinational circuit that is not uncommon in a building services engineering.
● Use Ohms’ Law to determine the voltage across and the current through the load RL.

a) Describe the construction of a single phase transformer. Explain the relevance of Lenz’s Law and Faraday’s Laws of electromagnetic induction to the operation of the transformer. Give two examples where they would be used in the Building Services Industry.
b) Detail the equations relating current, voltage, power, and turns ratio in a simple single phase transformer.
c) A 23O volt to 24 volt bell transformer is constructed with 6OO turns on the primary winding. Calculate the number of secondary turns and the primary and secondary currents when the transformer supplies a 24 volt 12 watt bell. (Include diagram).
d) A 1MVA transformer has an impedance of 4.5% what is the maximum fault level on the secondary side of the transformer?