KS4 Electricity – Electronic systems

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KS4 Electricity – Electronic systems

Logic gates Logic gates can have only one of two values 0 or 1, low or high. As the signals can only have one of two values, they are DIGITAL signals. The outputs for logic gates depend upon the inputs and are shown in a truth table.

Use a textbook or other resource to fill in the table below: Logic gate Circuit symbol NOT OR AND

Use a textbook or other resource to fill in the table below: Logic gate Circuit symbol NOR NAND

NOT gate inverts the input signal Output 1 1 NOT gate inverts the input signal

OR Input A Input B Output 1 1 1 1 1 1 1 1 Output is 1 if either of the inputs is 1, or if both inputs are 1.

AND Input A Input B Output 1 1 1 1 Output is 1 only if both of the inputs is 1.

Output is opposite of AND gate. NAND Input A Input B Output 1 1 1 1 Output is opposite of AND gate.

Output is opposite of OR gate. NOR Input A Input B Output 1 1 Output is opposite of OR gate.

Name this circuit symbol. NAND NOR NOT OR 

Name this circuit symbol. NAND NOR NOT OR 

Name this circuit symbol. AND NAND NOT OR 

Name this circuit symbol. OR NAND NOT NOR 

Name this circuit symbol. AND NAND NOT OR 