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2008-11-18 Nature of voltage and current: > Electric potential at a point is the amount of work needed > to be done to bring a unit charge from infinity to that point That is indeed how we on Earth define it. But you are skipping a step....
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2008-11-17 Nature of voltage and current: PART I > when we increase the voltage, the current should also increase That would be true ONLY if the original source of the voltage had unlimited amount of energy to give up. For a battery (in...
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2008-11-17 newton's third law of motion: When talking about a force, you MUST carefully specify two things: 1) BY WHAT is the force coming from? 2) ON WHAT is the force acting? Failure to keep track of these can lead to confusion. Let's...
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2008-11-12 The "why" of magnetism: > what causes magnetism?? what is it? First of all, understand that we live in a universe in which certain things are true, even if we don't yet (and maybe never will) understand the "why." Some...
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2008-11-12 fish in tank of water: Think of the situation this way. You have two buckets, one with water, one with fish only (they are flapping around, trying to get some water so they can breathe). You place them on the scale and get a...
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