Electric Motors (OCR GCSE Physics A, Combined (Gateway Science Suite)): Quizzes
📚Quizzes
Practise the questions
11 questions from this quiz
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Practise the questions
11 questions from this quiz
What happens when a coil carrying current is in a magnetic field?
What happens when a coil carrying current is in a magnetic field?
It experiences a force
What is each end of the coil connected to in a DC motor?
What is each end of the coil connected to in a DC motor?
A split-ring commutator
What does the flowing current create around the coil?
What does the flowing current create around the coil?
A magnetic field
Which two magnetic fields interact in a DC motor?
Which two magnetic fields interact in a DC motor?
Coil's field & permanent magnets' field
What determines the direction of force on the wire?
What determines the direction of force on the wire?
Direction of current
Why does the coil rotate in a DC motor?
Why does the coil rotate in a DC motor?
Upward force on one side, downward other
How far does the coil rotate before the commutator changes current direction?
How far does the coil rotate before the commutator changes current direction?
What does the split ring commutator ensure?
What does the split ring commutator ensure?
Torque continues in same direction
What connects the rotating and stationary parts of the motor?
What connects the rotating and stationary parts of the motor?
Carbon brushes
What do carbon brushes prevent?
What do carbon brushes prevent?
The coil from tangling
Why does the coil keep rotating after a half spin?
Why does the coil keep rotating after a half spin?
Reversed current maintains rotation