Ways of controlling Power

Electrical services differ from country to country. Methods that work well with a 240V system will not work with 120 V. Methods that work where both voltages are available are useless where only one voltage exists.

Most North American homes have both 120V and 240V available, although many, especially in areas served by gas, do not have any 240V circuits installed. Most of the rest of the world uses 240V exclusively. We have written three separate sections on stepwise control - one for people who have both 120V and 240V, one where only 120V power available, and one for those with only 240V.

"Truth" table

A

B

c

Power

0

0

0

0

1

0

0

Pi

0

1

0

P2

1

1

0

(P1+P2)

0

0

1

0

1

0

1

0

0

1

1

0

1

1

1

1 ON

0 OFF

1 ON

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