GCSE Physics Specification

OCR B J259

Section P3.6: How do electric motors work?

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#P3.6.1

describe the interaction forces between a magnet and a current-carrying conductor to include ideas about magnetic fields

#P3.6.2

show that Fleming’s left-hand rule represents the relative orientations of the force, the conductor and the magnetic field

#P3.6.3

select and apply the equation that links the force (F) on a conductor to the strength of the field (B), the size of the current (I) and the length of conductor (l) to calculate the forces involved:

force (N) = magnetic flux density (T) × current (A) × length of conductor (m)

#P3.6.4

explain how the force on a conductor in a magnetic field is used to cause rotation in the rectangular coil of a simple electric motor

Detailed knowledge of the construction of motors not required