1. A generator is designed to produce a maximum emf of 180 V while rotating with
ID: 2198177 • Letter: 1
Question
1. A generator is designed to produce a maximum emf of 180 V while rotating with an angular speed of 3600 rpm. Each coil of the generator has an area of 0.057 m2. If the magnetic field used in the generator has a magnitude of 0.050 T, how many turns of wire are needed? During the rotation of the coils, the magnetic flux through the coils will alternately be increasing and decreasing 2. While the flux is increasing, the induced current in the coils will make a B field which tries to (oppose/reinforce/none of the above/ not enough info) the external B field. 3. While the flux is decreasing, the induced current in the coils will make a B field which tries to (oppose/reinforce/none of the above/ not enough info) the external B field. 4. This generator will produce what kind of current? (AC/DC/None of the above/Not enough info)Explanation / Answer
emf = N * B * A *
= 3600 rev/min *2 rad/rev*1min/60s
= 377rad/s
N = emf / (B*A*)
= 180 / (0.050 * 0.057 * 377)
= 167.5
= 168 turns
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