Table of truth. (Physics)

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Hi I really don't understand table of truths. I got 4 questions asking me to draw the table of truth.
1) A alarm sounds when it has been armed and the front door is opened
2) a courtesy light comes on when the passenger door or driver's door of a car is opened
3) The warning light at the front of a washing machine light If there is no water supply or the heater is off
4) the heater comes on in the conservatory if it is both dark and cold.

I know this is a lot but if you could answer one or two of them then that will be very help Full.
Thanks.

Posted Thu 11th April, 2013 @ 18:02 by simran