Every time I look this up I am being shown how to use a Multimeter. But I want to know WHAT exactly is that multimeter doing? It is looking at the potential difference? But what exactly are the components doing inside. What would the simplest Multimeter look like
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Yes, analog meters exist and are fairly simple, but they are not really often used any more.
Analog oscilloscopes would amplify the voltage and use it to deflect electrons flying towards phosphors embedded on a screen.
Pretty much everything you’d use today is digital. This means that a circuit known as an analog to digital converter (ADC) is used to produce a digital value of a measured voltage. There are dozens of different ways in which they do this. Check out the [ADC page](https://en.wikipedia.org/wiki/Analog-to-digital_converter) of wikipedia to see several of them.
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