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physics 212 lecture 20: generators, motors, and maxwell s equations

2. Motor and Generator Equations. Flux through current loop: Flux is function of time:Induced voltage:Diagram:. 3. Some Basic Questions. 1. How do you keep the DC motor turning?2. Why are most generators AC?3. How does an alternator fit into these concepts?. 4. Maxwell's Equations.

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physics 212 lecture 20: generators, motors, and maxwell s equations

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    1. 1 Physics 212 – Lecture 20: Generators, Motors, and Maxwell’s Equations

    2. 2

    3. 3 Some Basic Questions 1. How do you keep the DC motor turning? 2. Why are most generators AC? 3. How does an alternator fit into these concepts?

    4. 4 Maxwell’s Equations

    5. 5 Example: Ch 31 #36 Automobile alternator has N=250 and flux=2.5x10^-4Wbcos(wt). Alternator rotates 3x for each engine revolution. If engine at 1000rpm, for alternator find (a) EMF as function of t (b) EMF max.

    6. 6 Example: Ch 31 #44 Electron in uniform magnetic and electric fields of E = 2.5i +5j V/m and B = 0.4k T. Find acceleration of electron if it has v = 10i m/s.

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