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Tutor HuntTest QuestionsPhysics QuestionsYear 10 Physics Questions

 

Electric Motors (ht Only) (GCSE Physics)

The following is a GCSE Physics test covering 'Electric Motors (ht Only)' from the broader topic Magnetism And Electromagnetism. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

What advantage do brushless DC motors have over brushed DC motors?
What happens to the direction of the force on a current-carrying wire in a magnetic field if you reverse the current direction?
In a simple DC motor, if the strength of the external magnetic field is doubled while other factors stay the same, what happens to the force on each side of the coil?
What is the unit of magnetic flux density B in the SI system?
Why are laminated iron cores used in motor stators and rotors rather than solid iron?
What happens to the current drawn by a DC motor when it is stalled (cannot rotate) compared with normal running?
Which change would reduce wear on the brushes in a brushed DC motor?
A wire carrying a current lies at right angles inside a uniform magnetic field. Which expression gives the magnitude of the force on the wire?
In an electric motor, what is the role of the brushes?
When a motor reaches a steady speed under load, how does the back EMF compare to the supply voltage?
Which is a possible effect of increasing the supply voltage to a DC motor above its rated value?