Definitions

fleming's rules

Fleming's right hand rule

Fleming's right hand rule (for generators) shows the direction of induced current flow when a conductor moves in a magnetic field.

The right hand is held with the thumb, first finger and second finger mutually at right angles, as shown in the diagram .

  • The Thumb represents the direction of Motion of the conductor.
  • The First finger represents the direction of the Field.
  • The Second finger represents the direction of the induced or generated Current (in the classical direction, from positive to negative).
  • One particular way of remembering the rule is the "FBI" acronym for Force(or otherwise motion), B as the magnetic field sign and I as the current. The subsequent letters corespond to subsequent fingers, counting from the top. Thumb -> F; First finger -> B; Second finger -> I

There is also a Fleming's left hand rule (for electric motors). The appropriately-handed rule can be recalled from the letter "g", which is in "right" and "generator".

These mnemonics are named after British engineer John Ambrose Fleming, who invented them.

Symmetry

Vector Left-Motor or Right-Generator Left-Motor or Right-Generator Left-Motor or Right-Generator Right-Motor or Left-Generator Right-Motor or Left-Generator Right-Motor or Left-Generator
B or Field First or Index Thumb Fingers or Palm First or Index Thumb Fingers or Palm
I or Current (+ to - flow) Fingers or Palm First or Index Thumb Thumb Fingers or Palm First or Index
Force, Motion, or Thrust Thumb Fingers or Palm First or Index Fingers or Palm First or Index Thumb

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