Assessment booklet Complete the long exam type question in your

assessment booklet - Read the question carefully and highlight key phrases

What is the question asking Be careful with spelling and grammar

8 mins

Swop booklets with your pair and assess:Clarity of answerGrammarSpellingcontent

P6 – Electricity for Gadgets

Lesson 6 – Logic gates

Learning aim: Demonstrate an understanding of logic gates and circuits in electrical systems

Learning Objectives Success Criteria

Recognise the link between transistors and logic gates.

Describe truth tables for logic gates.

Draw transistor diagrams for AND gates.

Recall what is joined together to make logic gates and what the input means in terms of voltage.(Grade E-D)

Describe the truth tables for a NOT gate.(Grade E-D)

Recall how other logic gates can be made and draw truth tables for an OR gate.(Grade C)

Recognise/Complete the circuit diagram for an AND gate and describe its truth table.(Grade D-A)

Describe truth tables for NAND and NOR gates.(Grade C-A)

MHW3Research Michael FaradayBe able to describe in 3 sentencesWhy he is a famous scientist

On white boards draw the symbols for the below textbook p240-241 Help:

Logic gate Circuit symbol

NOT

OR

AND

Logic gate Circuit symbol

NOR

NAND

Use the textbook 241to fill in the table below in your book:

Read pg240Answer question 6 and 7

Then What is the input signal in a logic

gate in terms of voltage?

Answer: Q6 0 V • Q7 0 V

NOT

Input Output

0

1

1

0

NOT gate inverts the input signal. The output is NOT the input

OR

Input A Input B Output

0 0

0 1

1 0

1 1

0

1

1

1

Output is 1 if input A OR input B is 1.

AND

Input A Input B Output

0 0

0 1

1 0

1 1

0

0

0

1

Output is 1 only if input A AND input B are 1.

NAND

Input A Input B Output

0 0

0 1

1 0

1 1

1

1

1

0

Output is the opposite of an AND gate. The output in NOT an AND

HT

NOR

Input A Input B Output

0 0

0 1

1 0

1 1

1

0

0

0

Output is the opposite of an OR gate. The output is NOT and OR

HT

Draw a truth table to find the output of this combination

ExperimentP6c02part A or B

To doRead through p241 in the text

book and answer questions 8-9 on whiteboards

Complete worksheet P6c02Q1Then challenge/ HTQ2

Answer: Q8 AND gate • Q9 OR gate

Answers to WS p6c02Q1a(i) off; off; off; on • Q1a(ii)

AND • Qb(i) off off off; off on on; on off on; on on on • Q1b(ii) OR • Q2a(i) 1 •Q2a(ii) 0 • Q2a(iii) NOT • Q2b(i) C = 0, 0, 0, 1; D = 1, 1, 1, 0 • Q2b(ii) AND.

Now try Q10

System input X

System input Y

AND gate input x

AND gate input y

Output Z

0 0 1 1 1

0 1 1 0 0

1 0 0 1 0

1 1 0 0 0

HT

Some problems to solve

• The pump on a central heating system is switched on at room temperature if the system is switched on (with the slide switch). When the temperature rises the pump needs to be switched off.

• Design a circuit that will sound a buzzer if the temperature of a hot radiator falls during the day ONLY. Include a test switch to check the operation of the buzzer.

• Design a circuit for a gardener that will warn them of cold conditions at night. The alarm should be able to be switched off.

Plenary questions

Name this circuit symbol.

A. NAND

B. NOR

C. NOT

D. OR

Name this circuit symbol.

A. NAND

B. NOR

C. NOT

D. OR

A. AND

B. NAND

C. NOT

D. OR

Name this circuit symbol.

A. OR

B. NAND

C. NOT

D. NOR

Name this circuit symbol.

A. AND

B. NAND

C. NOT

D. OR

Name this circuit symbol.

Learning Objectives Success Criteria

Recognise the link between transistors and logic gates.

Describe truth tables for logic gates.

Draw transistor diagrams for AND gates.

Recall what is joined together to make logic gates and what the input means in terms of voltage.(Grade E-D)

Describe the truth tables for a NOT gate.(Grade E-D)

Recall how other logic gates can be made and draw truth tables for an OR gate.(Grade C)

Recognise/Complete the circuit diagram for an AND gate and describe its truth table.(Grade D-A)

Describe truth tables for NAND and NOR gates.(Grade C-A)