Consider this circuit.
What would I get if I measure over R1? It should be less than 12v, right? But then what volatage is LAMP1 running at? Is it still 12v, or is it the voltage I measured across R1? If it's 12v, then why didn't the voltmeter show 12v since it's connected to the supply in the same way as the lamp (IE over R1)?
I'm confused because the wiki article on parallel and series circuits states that:
If the light bulbs are connected in parallel, the currents through the light bulbs combine to form the current in the battery, while the voltage drop is 6.0 V across each bulb and they all glow.
(The wiki article uses a 6V supply instead of a 12V for their example)
So what is the voltage drop across LAMP1, and if it is different to the measurement across R1, then why?