Javalab [Javalab] Lars Drud Nielsen
ldn@oersted.dtu.dk

Heating elements

The two resistors (heating elements) can be connected to the voltage source by the four switches - in some useful, some less useful, and even some inappropriate ways (out of the total of 16 combinations).

With a proper choice of resistance values the five switch combinations in the table below will establish a heater function with a zero and four distinct non-zero power levels (P):

0 1 2 3 4
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
ON
ON
OFF
ON
OFF
ON
OFF
ON
ON

With the two resistance values being equal the four non-zero power levels will degenerate into only three distinct values of P. A kind of optimal spreading of four values of P is obtained by choosing a resistance ratio around (2)½.

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