An LED in parallel with a Tortoise, fed by a 12V power supply, gets 12 volts. So two Tortoises in parallel will draw 30ma fromt he power supply (15ma x 2). Parallel law: Load in parallel get the same voltage, currents add. And if you feed the combination with 12V, and the LED has a forward voltage of 3V, the Tortoise gets what's left over, or 9V. So a Toroise that draws 15ma, anything in series with said Tortoise will ALSO get 15ma. Series law: Loads in series each get the same current. It explains why Ohm's Law works to calculate a resistor to use with an LED, among other things. Kichoff's Laws are for series and parallel circuits. Back to the basics - another fundamental electrical law like Ohm's Law.
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