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Old 12-22-2009, 05:17 AM
 
Location: Bradenton, Florida
27,236 posts, read 44,057,503 times
Reputation: 11022

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Quote:
Originally Posted by burdell View Post
IF generators produce electicity with no physical resistance, WHY does it take things like steam turbines to power them, why not just spin 'em up by hand? Generator is a misnomer, it doesn't generate electricity, it converts mechanical energy to electrical energy with (usually) some loss due to friction.
They COULD, but why do that when they can use steam power, and not have to have someone in attendance? I had a weather radio that you powered by spinning a dial--you just wound it up. It generated enough electricity to run the radio for a couple of hours. There wasn't a large amount of resistance. You also have something called "shake lights", all you have to do to generate power for them is to shake them a bit. Mechanical energy, being converted into electrical energy.
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Old 12-22-2009, 05:21 AM
 
Location: Bradenton, Florida
27,236 posts, read 44,057,503 times
Reputation: 11022
Quote:
Originally Posted by JBrown View Post
4: I'm sure you've jumped a car at some time in your life.

Ever notice that the car giving the jump, idling along just fine, drops in rpm when you make the last connection to the car your jumping ?? Why is that ??

The car giving the jump was idling fine, the alternator was spinning merrily along etc..then you make the final connection and wow...the engine in the car giving the jump loads up (a drop in rpm)..

hint...now in addition to just spinning the armature in the alternator you're also connected to an electrical load which needs more mechanical power to produce the electricity to deliver to the dead car.


I suggest you get a copy of a high school science book...read the sections on electricity and magnetism. you should find it illuminating.

No, I've never "jumped" a car. I don't drive.

You provide the "torque" when you push the cart--you are converting the kinetic/mechanical energy of you pushing the cart to induce the current. You do not have to have additional resistance, i.e., make the cart harder to push, to create "torque". You are providing it by turning the wheels when you push the cart.
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Old 12-22-2009, 05:23 AM
 
Location: Bradenton, Florida
27,236 posts, read 44,057,503 times
Reputation: 11022
Quote:
Originally Posted by harborlady View Post
Why would anyone need a degree in microwaves communicating with one another? Why can't they just cook food minus the chit chat?
Microwaves are just a band on the spectrum through which communications can be made. That's all.
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