Digital Electronics (GCSE Physics)
Digital Electronics
Analogue and Digital Signals
Analogue Signals
Analogue signals vary and can be of any value.
![](https://studymind.co.uk/wp-content/uploads/2022/05/1-125.png)
Digital Signals
Digital signals can only be one of two values.
![](https://studymind.co.uk/wp-content/uploads/2022/05/2-86.png)
Logic Gates
A logic gate is a component in an electronic circuit which produces an output. The output is dependent on the input.
There are several types of gates:
- A NOT gate has a single input and output. For a NOT gate, an input of 1 will produce an output of 0. An input of 0 will produce an output of 1.
- An AND gate has two inputs and one output. For an AND gate, the two inputs need to be 1 in order for an output of 1 to be produced. If only one input is 1, the output will still be 0.
- An OR gate has two inputs and one output. One of the two inputs need to be 1 in order for an output of 1 to be produced. If both inputs are 1, the output will still be 1.
- A NAND gate works opposite to an AND gate. It has two inputs and one output like an AND gate. The output it always 1 unless both of the inputs are 1.
- A NOR gate works opposite to an OR gate. It has two inputs and one output like an OR gate. The output is only 1 if both of the inputs are 0.
A truth table can be used to work out the output of a circuit, based on the different inputs. This would show the different possibilities of outcomes in a circuit.
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