Microblog post: "My son is only in 10th grade and look what he invented!! Harvard here we come!". Pictures of a frame that holds a cable that can be attached to the metal of a power plug
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[–] 1 point 5 hours ago (3 children)

oh, very interesting -- for the clock radio example, wouldn't the radio fry the circuit board before it tripped the breaker?

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  • [–] 3 points 3 hours ago* (1 child)

    It depends on where the fault is. Starting at the input power from the cord, the first component on the circuit board is going to be a factory installed fuse. It's probably the same on circuit boards made for UK and EU devices because it makes good engineering sense to do it that way, even if the plug is equipped with a fuse. So if the fault is somewhere on the board, it blows the appliance fuse. If it's somewhere before the appliance fuse, it blows either the plug fuse (if equipped), or the breaker.

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