=for timestamp
Do Apr 27 17:02:24 CEST 2006

=head2 Elektromotor und Generator

=for comment
Referat von Nussi und Heiko am 27.4.2006.

=head4 Elektromotor

=over

=item *

Permanenzmagnete

=item *

Anker (Eisenkern, Spule(n))

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Schleifkontakte

=item *

Kommutator

=back

M<\eta = \frac{P_{\text{ra}} t}{P_{\text{re}} t} = \frac{U_{\text{i}} I}{U_0 I}
= \frac{U_{\text{i}}}{U_0} = \frac{U_0 - U_R}{U_0} = 1 - \frac{U_R}{U_0};>

=head4 Generator (B. S. 260)

M<U_{\text{i}} = N \dot\phi = N \dot{\left(A B\right)} = n B \dot A = n B
\dot{\left(\hat A \cos \omega t\right)} = n B \hat A \omega \cdot \sin \omega
t;>

M<P = \frac{U^2}{R};>