Comments: Voltage, Current, Resistance, and Ohm's Law


Comments 7 comments

  • “We’ve chosen a resistor value that is high enough to keep the current through the LED below its maximum rating, but low enough that the current is sufficient to keep the LED nice and bright.”

    I think you need to reverse “high” and “low” there. It’s low enough that it won’t exceed the LED’s rating; it’s high enough to keep the LED bright.

    • Nope - the references (high and low) are in the correct positions. If the statement was, “We’ve chosen a CURRENT value…“ THEN you would need to swap them out. The current needs to be below the current rating - higher resistance means lower current, and lower resistance means higher current.

  • At first it says voltage is a difference in charge between two points. If it’s a difference in charge, why can’t it be measured in coulombs?

  • very good for me !!

  • Very interesting and much useful. Thank u… So much.

  • I suggest you guys make series of tutorial videos in the education channels for youngsters, and put them up on MOOC channels.

  • Thank you for the explanation. Very easy to understand.

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