________ losses are present in all rotating machines. Even brushes riding on the commutator are a source of ________.

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Multiple Choice

________ losses are present in all rotating machines. Even brushes riding on the commutator are a source of ________.

Explanation:
Friction losses are present in all rotating machines. Whenever surfaces slide or rub against each other, such as bearings or the contact between brushes and the commutator, energy is dissipated as friction. The brushes riding on the commutator create this sliding contact, making friction a source of those losses. While heat is a result of friction, the statement points to friction as the category of losses and as the direct source of the resistance at the brush-commutator interface.

Friction losses are present in all rotating machines. Whenever surfaces slide or rub against each other, such as bearings or the contact between brushes and the commutator, energy is dissipated as friction. The brushes riding on the commutator create this sliding contact, making friction a source of those losses. While heat is a result of friction, the statement points to friction as the category of losses and as the direct source of the resistance at the brush-commutator interface.

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