A signal is a physical quantity that changes over time or space.
Examples include changes in sound pressure, light, temperature, voltage, or current.
An electrical signal is a changing electrical quantity, usually voltage or current.
In electrical and electronics textbooks, signals are often shown as graphs:
Voltage
↑
| /‾\ /‾\
| / \ / \
|____/ \__/ \____ → TimeIn this graph:
- the horizontal axis represents time,
- the vertical axis represents the signal value, often voltage,
- the curve shows how that value changes over time.
So, in simple terms:
Signal: a physical quantity that changes.
Electrical signal: a voltage or current that changes over time.
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