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3.12 A carbon brush used to conduct current from the commutator of a DC generator has a length of 4 in. It must conducta current of 400 A with a voltage drop not exceeding 2 V. Determine the cross-sectional area of this carbon brush.

3.12 A carbon brush used to conduct current from the commutator of a DC generator has a length of 4 in. It must conducta current of 400 A with a voltage drop not exceeding 2 V. Determine the cross-sectional area of this carbon brush.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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3.12 A carbon brush used to conduct current from the commutator of a DC generator has a length of 4 in. It must conduct a current of 400 A with a voltage drop not exceeding 2 V. Determine the cross-sectional area of this carbon brush. 3.13 Early DC machines use brass brushes instead of carbon brushes. The com- mutator bars do not last very long since brass is a rather hard metal. If a brass brush of the dimensions determined in problem 3.12 is used instead to conduct the same current, determine the voltage drop.
Transcribed Image Text:3.12 A carbon brush used to conduct current from the commutator of a DC generator has a length of 4 in. It must conduct a current of 400 A with a voltage drop not exceeding 2 V. Determine the cross-sectional area of this carbon brush. 3.13 Early DC machines use brass brushes instead of carbon brushes. The com- mutator bars do not last very long since brass is a rather hard metal. If a brass brush of the dimensions determined in problem 3.12 is used instead to conduct the same current, determine the voltage drop.
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