A digital signal only has two values; HIGH and ____. Sometimes this is called ____ and OFF. In contrast, an analogue signal ____ continuously and can have ____ value between zero and a ____ value. AM and FM ____ uses analogue radio signals. ____ radio uses digital radio signals. Electronic components can also be either digital or ____. Digital components only have two settings - on or off. A switch can be either open (off) or ____ (on) which means it is a digital component. Other examples of digital components are; ____ (light emitting diode), ____ (electromagnetic switch), ____ actuator (electromagnetic lock), ____ (creates a single tone). Analogue components can have a range of values or settings. A ____ has a range of resistance values, which means it is an analogue component. Other examples of analogue components are; ____ (light dependent resistor), ____ (resistor which varies with temperature), ____ (converts sound energy to electrical energy), and ____ (converts electrical energy to sound energy).

Understanding digital and analogue

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