Bredhurst Receiving and Transmitting Society

Advanced Radio Amateur Examination

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Circuit theory

In this section we come across the formula . Remember we are dealing here with a potential divider . so how do we use the calculator.

The above equation could be written as

Example R1 = 10 R2 = 40 Vin 45 what are the voltsout
454010 40
	The picture opposite is infact wider than your calculator screen so that it shows in one go all the key strokes.
With this example we are using the "math's rule" explained earlier where a figure before a bracket mean multiply unless there is another function shown.
Result 36 Vout

So that completes the calculations for this set.

There are more functions to show you but it is hoped that you have taken all the above onboard and it is time to give yourself  a coffee / tea break !!!

Next Capacitance