1. KS4 Electricity – Electronic systems

2. 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.

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

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

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

6. OR Input A Input B Output 1 1 1 11 1 1 1
Output is 1 if either of the inputs is 1, or if both inputs are 1.

7. AND Input A Input B Output 1 11 1
Output is 1 only if both of the inputs is 1.

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

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

10. Name this circuit symbol.
NAND
NOR
NOT OR 

11. Name this circuit symbol.
NAND
NOR
NOT OR 

12. Name this circuit symbol.
AND
NAND
NOT OR 

13. Name this circuit symbol.OR
NAND
NOT
NOR 

14. Name this circuit symbol.
AND
NAND
NOT OR 