HWK38s_11G(1) - from your arm using a hand crank or from a...

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HWK 38 (SOLUTIONS) (due 4/27/07) Read chp. 37 sections 1-3 Do 2, 3, 9, 30 2. Moving the magnet near the wire will cause the wire to be in a changing magnetic field. The changing magnetic field induces a voltage across the wire. 3. Moving a magnet into a coil with more turns will result in a greater voltage induced across the coil. Each loop gets voltage induced across it and these add up in series. 9. The armature of a generator is a wire wound shaft i.e. a coil with an iron core. Rotating the armature in a magnetic field generates electricity. Some input work is needed to rotate the armature. This work can come
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Unformatted text preview: from your arm using a hand crank, or from a steam driven turbine, etc. 30. A generator is more diFcult to rotate when connected to and supplying electric current because the work input must be at a fast enough rate to power both the current and the rotational motion. If the circuit is not hooked up, then yoiu need only supply enough power for the rotational motion. (We saw this way back when we used the hand driven generator to power a light bulb and then disconnected the bulb.) 1...
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