Logic gates
10 flashcards to master Logic gates
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Draw the truth table for an AND gate.
An AND gate outputs '1' (TRUE) only if both inputs are '1' (TRUE). Otherwise, the output is '0' (FALSE). The truth table has input columns A and B, and output column Q, with rows: 0 0 0, 0 1 0, 1 0 0, 1 1 1.
Describe the function of an OR gate.
An OR gate outputs '1' (TRUE) if at least one of its inputs is '1' (TRUE). It only outputs '0' (FALSE) if all inputs are '0' (FALSE).
What logic gate is represented by the Boolean expression Q = NOT A?
The Boolean expression Q = NOT A represents a NOT gate. The NOT gate inverts the input; if A is '1', Q is '0', and vice-versa.
Draw the logic gate symbol for a NAND gate.
A NAND gate symbol is an AND gate symbol followed by a small circle (inversion bubble) at the output. The circle represents the NOT operation.
Explain the difference between a NOR gate and an OR gate.
A NOR gate is the inverse of an OR gate. Where an OR gate outputs '1' if any input is '1', a NOR gate outputs '1' only if *all* inputs are '0'.
Create the truth table for a NOT gate.
A NOT gate takes a single input and inverts it. If the input (A) is '0' (FALSE), the output (Q) is '1' (TRUE). If the input is '1' (TRUE), the output is '0' (FALSE). Truth table has two rows: 0 1, 1 0
Define the term 'logic gate'.
A logic gate is an elementary building block of a digital circuit. It takes one or more binary inputs (0 or 1) and produces a single binary output based on a logical operation.
What is a 'truth table' used for in the context of logic gates?
A truth table is a table that shows all possible combinations of inputs to a logic gate (or circuit) and the corresponding output for each combination. It completely defines the behavior of the gate.
Write the Boolean expression for a NOR gate with inputs A and B and output Q.
The Boolean expression for a NOR gate with inputs A and B and output Q is: Q = NOT (A OR B).
Describe how a logic circuit can be created from logic gates.
A logic circuit is formed by connecting multiple logic gates together, where the output of one or more gates can be used as the input to other gates, implementing more complex logical functions.
Key Questions: Logic gates
Describe the function of an OR gate.
An OR gate outputs '1' (TRUE) if at least one of its inputs is '1' (TRUE). It only outputs '0' (FALSE) if all inputs are '0' (FALSE).
Explain the difference between a NOR gate and an OR gate.
A NOR gate is the inverse of an OR gate. Where an OR gate outputs '1' if any input is '1', a NOR gate outputs '1' only if *all* inputs are '0'.
Define the term 'logic gate'.
A logic gate is an elementary building block of a digital circuit. It takes one or more binary inputs (0 or 1) and produces a single binary output based on a logical operation.
What is a 'truth table' used for in the context of logic gates?
A truth table is a table that shows all possible combinations of inputs to a logic gate (or circuit) and the corresponding output for each combination. It completely defines the behavior of the gate.
Describe how a logic circuit can be created from logic gates.
A logic circuit is formed by connecting multiple logic gates together, where the output of one or more gates can be used as the input to other gates, implementing more complex logical functions.
About Logic gates (3.4)
These 10 flashcards cover everything you need to know about Logic gates for your Cambridge IGCSE Computer Science (0478) exam. Each card is designed based on the official syllabus requirements.
What You'll Learn
- 5 Definitions - Key terms and their precise meanings that examiners expect
- 5 Key Concepts - Core ideas and principles from the 0478 syllabus
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