Rules to assist in remembering the relative directions of the field, current, and force in electrical machines. The left hand refers to motors, the right hand to generators. If the forefinger, second finger, and thumb of the left hand are extended at right angles to each other, the forefinger indicates the direction of the field, the second finger the direction of the current, and the thumb the direction of the force. If the right hand is used the digits indicate these directions in a generator. The mnemonic was invented by Sir John Ambrose Fleming (1849–1945) in the late 19th century.
Fleming’s rules. Fleming’s rule for the force experienced by a current-carrying conductor in a magnetic field.
Mnemonics in frequent use by practical electricians for the directional relation between current, motion, and magnetic field in a dynamo or electric motor. In each case the thuMb represents the direction of Motion, the First finger represents the Field, and the mIddle finger the current, I. When these three fingers are held at right angles, the right hand represents the relation in a dynamo (right-hand rule) and the left hand represents the relation in an electric motor (left-hand rule).
- rising film evaporator
- rising limb
- risk
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