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8 - Logic Gates
Logic Gates
Pens, pencils and paper needed
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Slide 1:
Tekstslide
Computing
Upper Secondary (Key Stage 4)
GCSE
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21 slides
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Logic Gates
Pens, pencils and paper needed
Slide 1 - Tekstslide
Can you remember the three main logic gates?
Slide 2 - Open vraag
Key Objective: To gain undetstanding of boolean logic and Logic Gates.
All: Know the Main three logic gates, their symbols and truth tables.
Most: Understand some simple logic gate problems.
Some: Understand more complex problem solving with logic gates.
Slide 3 - Tekstslide
Anatomy of a logic gate
Slide 4 - Tekstslide
Truth Table: AND
Copy down the symbol and table
Input A
Input B
Output
0
0
0
1
1
0
1
1
Slide 5 - Tekstslide
AND gate with two inputs.
Input A = 1, Input B = 0
What is the output?
A
1
B
0
Slide 6 - Quizvraag
AND gate with 3 inputs.
Input A = 1, Input B = 1, Input C = 0
What is the output?
A
1
B
0
Slide 7 - Quizvraag
Truth Table: OR
Copy down the symbol and table
Input A
Input B
Output
0
0
0
1
1
0
1
1
Slide 8 - Tekstslide
OR gate with 2 inputs.
Input A = 0, Input B = 0
What is the output?
A
1
B
0
Slide 9 - Quizvraag
OR gate with 3 inputs.
Input A = 0, Input B = 0, Input C = 1
What is the output?
A
1
B
0
Slide 10 - Quizvraag
OR gate with 2 inputs.
Input A = 1, Input B = 1
What is the output?
A
1
B
0
Slide 11 - Quizvraag
Truth Table: NOT
Copy down the symbol and table
Input A
Output
0
1
Slide 12 - Tekstslide
Logic Gate Expressions
a AND (NOT b)
a
b
Output
0
0
1
0
0
1
1
1
Slide 13 - Tekstslide
Open Logic.ly
here
Draw
(a OR b) AND (NOT c)
with logic gates:
Slide 14 - Tekstslide
(a OR b) AND (NOT c)
Now, draw the truth table.
Slide 15 - Tekstslide
(a OR b) AND (NOT c)
A
B
C
Output
0
0
0
0
0
1
0
1
0
1
0
0
0
1
1
1
0
1
1
1
0
1
1
1
Slide 16 - Tekstslide
Research task
Research with google:
NAND gates
NOR gates
XOR gates
Create with logic.ly a drawing using all three of these, and write the truth table for it.
Slide 17 - Tekstslide
Which Logic gate is this?
A
AND
B
OR
C
NOT
Slide 18 - Quizvraag
Which Logic gate is this?
A
AND
B
OR
C
NOT
Slide 19 - Quizvraag
Which Logic gate is this?
A
AND
B
OR
C
NOT
Slide 20 - Quizvraag
A
1
B
0
Slide 21 - Quizvraag
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