Applications of the Motor Effect (HSC SSCE Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What type of energy conversion occurs in a DC motor?
What type of energy conversion occurs in a DC motor?
Electrical potential to kinetic energy
In the formula , what does represent?
In the formula , what does represent?
Magnetic field strength in tesla
When is the force on a current-carrying wire in a magnetic field greatest?
When is the force on a current-carrying wire in a magnetic field greatest?
When current is perpendicular to field
What is the torque formula for a current-carrying loop in a magnetic field?
What is the torque formula for a current-carrying loop in a magnetic field?
What is the primary function of a commutator in a DC motor?
What is the primary function of a commutator in a DC motor?
Reverses current every half rotation
Which component is part of the rotor in a DC motor?
Which component is part of the rotor in a DC motor?
Commutator
What material are brushes typically made from in a DC motor?
What material are brushes typically made from in a DC motor?
Carbon or graphite
How does increasing the number of turns in a coil affect torque?
How does increasing the number of turns in a coil affect torque?
Torque increases proportionally:
What is back emf in a DC motor?
What is back emf in a DC motor?
Induced voltage opposing applied voltage
How does back emf affect motor speed as the motor spins faster?
How does back emf affect motor speed as the motor spins faster?
Back emf increases, limiting max speed