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Logic Gates Worksheet

Using the model of a decision board and the gates provided to solve the situations.

Once you have set up your logic gates and connected them with lines drawn on the board from the pens provided, you will now be able use them to create a truth table of the inputs and outputs.

Draw your logic diagram and truth table in your jotters, make sure you use a ruler.

When drawing your logic diagrams and truth tables in your jotters set them out like the example below.

Create a logic diagram and truth table for a warning light to go on when a car engine gets too hot. The lamp should only work when the ignition of the car is switched on.

Create a logic diagram and truth table which will switch on the motor for the pump of a central heating system when the house is cold and the central heating is switched on.

Create a logic diagram and truth table which will turn on the motor for a heater in a greenhouse when it gets cold at night. The heater should be switched off during the day.

A rare diamond is locked in a safe. The diamond is sitting on a pressure sensor which acts like a switch. If the diamond was lifted up the switch would turn off. Create a logic diagram and truth table which will turn on a buzzer in the safe when it is light inside or if the switch is turned on.

Input Device

Output

Device

LOGIC GATE

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INPUTS

OUTPUTS

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More Taxing Logic Gate Diagrams

Using the same method that you did for the previous set of situations, create logic diagrams and truth tables for the following situations.

Some of these situations may involve more than two inputs, remember to count up to 7 in binary to work out all the combinations for the inputs of these truth tables.

Create a logic diagram for a shop owner who wants a buzzer to sound when either the temperature inside the shop gets to high or if someone turns on a light whilst pressing down a pressure switch under the door mat to ‘on’.

Create a logic diagram and truth table for a display window which will have a light going on when it is switched on or if it is both dark and cold.

Create a logic diagram and truth table for a heater to be turned on when it is cold and when it is either dark or switched on.