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Questions and Answers
What type of current does a DC motor use?
What type of current does a DC motor use?
- Variable current (VC)
- Direct current (DC) (correct)
- Alternating current (AC)
- Fluctuating current (FC)
What do nearly all types of DC motors rely on to produce magnetic forces?
What do nearly all types of DC motors rely on to produce magnetic forces?
- Resistance in the coils
- Voltage in the coils
- Capacitance in the coils
- Currents in the coils (correct)
How can a DC motor's speed be controlled over a wide range?
How can a DC motor's speed be controlled over a wide range?
- Using a fixed supply voltage and changing the resistance of the coils
- By varying the number of coils in the motor
- By adjusting the frequency of the input current
- Using either a variable supply voltage or by changing the strength of current in its field windings (correct)
In what type of motor can a lightweight brushed motor used for portable power tools and appliances operate?
In what type of motor can a lightweight brushed motor used for portable power tools and appliances operate?
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What has made replacement of DC motors with AC motors possible in many applications?
What has made replacement of DC motors with AC motors possible in many applications?
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