He's not going in as much detail as possible i think

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If you don't understand how he explains Ohm's Law, you can always read the transcript which is located directly below the video. Or you can look it up yourself and try to find other articles or videos that can help you. But to be put in easier more comprehendable words... Ohm's Law (V=IR) deals with the relationship between voltage and current in an ideal conductor. This relationship states that the potential difference (voltage) across an ideal conductor is proportional to the current through it.