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Re: Flashlight

On Tue, 31 Jul 2001, Ludwik Kowalski wrote:

In a private message XXX wrote:
For example, in paragraph 5 where power is introduced, why
is power the product of potential difference and current? Is
there an analogy to mechanics or fluid dynamics that might
help here?


I've always wondered if kids could better grasp "flow rate" if they first
have a firm grasp on the quantity which flows. Many books introduce
current without first delving into the flowing quantity: charge. Many
also introduce power without delving into electromagnetic energy. It's
like discussing rivers without ever bringing up the topic of water.


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