Newbie Voltage Question

Hi all

I know that voltage is measured in this way :

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there are two measuring points.

I do not understand how voltage can be supplied on one pin like here:

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Can someone please explain this to me?

Thank you

When unstated, the norm is that the voltage is referenced to ground voltage.

checkmate said:

When unstated, the norm is that the voltage is referenced to ground voltage.

Click to expand...

Yes, it's something you have to careful with! - normally an opamp will use a split supply (say + and - 12V), in this case you would normally measure with respect to the 0V point (the junction of the two supplies), and would get positive and negative voltages.

If the opamp is fed from a single supply, you may well measure from the -ve rail - in which case you would only get positive voltages.

As I said, you need to be careful, and aware of where you measure from!.