What would excessive sparking at the brushes...

Question 1 / 270705eccefa3bacbc34ba4d480a2

Question 1 of 270705eccefa3bacbc34ba4d480a2

What would excessive sparking at the brushes of a running DC motor be an indication of?

Question 1 of 27070

What would excessive sparking at the brushes of a running DC motor be an indication of?

🔍 Key Concepts

• Role of brushes and commutator in a DC motor • Effects of dirt, wear, or poor contact between brushes and commutator • Difference between normal brush arcing and excessive sparking

💭 Think About

• Think about what has to happen electrically at the point where the brushes touch the commutator for the motor to run smoothly. • Ask yourself: what condition at that contact point would make the current jump through the air more than usual, creating visible sparks? • Consider whether each choice would make the electrical contact between brush and commutator better, worse, or have no real effect.

✅ Before You Answer

• For each option, decide if it would cause better or worse electrical contact between brush and commutator. • Ask whether the condition would likely increase resistance or uneven contact at the commutator surface. • Eliminate any choice that would be associated with improved performance rather than a problem or fault.

Question 1 of 27070

What would excessive sparking at the brushes of a running DC motor be an indication of?

normal operation

a dirty commutator

increased brush capacity

water vapor absorption