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Total voltage drop in series circuit


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Im currently reading a book on electronics, that says that the sum of the Voltage drops across all components tied in series should equal the voltage of the battery.

However i tested cicuit on a breadboard with a led and a resistor, and measured the drops accross each and added them together. They did not add up to the supply voltage.

Anyone have any ideas?

Thanks very much. :)

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Thanks for the reply.

worked out what the problem was.

This is very strange, but i was using a Nokia Charger which provides 8.78V with nothing connected., but for some reason when you measure the drops across everything connected (resistors) in series, it looses a volt or two!

Any idea why?

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