You know you miss the days of looking at formulas all day while you were in school. Relive those glory days with the Ohms Law Clock. It has all the formulas that relate power, current, voltage and resistance. Place it behind that kid you are tutoring and you will have all the answers at your fingertips. It will make you look twice as smart as you think you are.
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Not only is this nerd approved, but it just got blue collar approved. Go electricians!
In physics, I’ve never heard of E being voltage. Is this an engineering usage?