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Component 1 Discovering Electronics

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How does a logic circuit add binary numbers, and how is the half adder extended to a full adder?

Binary numbers and adders: counting in binary, the half adder (sum and carry), the full adder with a carry in, and adding multi-bit numbers.
An Eduqas GCSE Electronics answer on binary arithmetic and adders: counting in binary and converting to decimal, the half adder built from XOR and AND giving sum and carry, the full adder that includes a carry in, and chaining full adders to add multi-bit binary numbers.
13 min answer →

How are logic circuits written and simplified using Boolean algebra?

Boolean algebra: writing Boolean expressions for gates, the laws of Boolean algebra, De Morgan's laws, and simplifying an expression to use fewer gates.
An Eduqas GCSE Electronics answer on Boolean algebra: writing Boolean expressions using the AND, OR and NOT notation, the main laws of Boolean algebra, De Morgan's two laws, and simplifying an expression so a logic circuit uses fewer gates.
13 min answer →

How do you turn a set of requirements into a working logic circuit, and why are NAND and NOR universal?

Designing combinational logic: building a circuit from a truth table or word description, combining gates, and the universal NAND and NOR gates.
An Eduqas GCSE Electronics answer on designing combinational logic: turning a word description or truth table into a Boolean expression and a gate circuit, combining gates into a system, and using the universal NAND and NOR gates to build any function from one gate type.
13 min answer →

What do the logic gates do, and how is each one described by a truth table?

Logic gates: AND, OR, NOT, NAND, NOR and XOR, their symbols and truth tables, and the digital high and low logic levels.
An Eduqas GCSE Electronics answer on logic gates: the AND, OR, NOT, NAND, NOR and XOR gates with their symbols and truth tables, the meaning of logic high and logic low, and how a truth table lists the output for every combination of inputs.
13 min answer →