a.) state Fleming's left hand rule.b.) write principle of working of an electric motor.c.) explain the function of the following parts of an electric motor. i) armature ii) brushes iii) split rings.
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Answer:
Solution
(a) Fleming's left hand rule, According to Fleming's left hand rule, hold the forefinger, the centre finger and the thumb of your left hand at right angles to one another. Adjust your hand in such a way that the forefinger points in the direction of magnetic field and the centre finger points in the direction of force acting on the conductor. <br> (b) Principle of an electric motor. The working principle of an electric motor is based on the magentic effect of current. An electric motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously. It is based on Fleming's left hand rule. <br> (c ) (i) Armature . It is the rotating part of a motor. Armature is a coil which carries current and rotates in the magentic field. <br> (ii) Brushes. The function of carbon brushes is to make contact with the rotating split-rings of the commutator so as to supply current to the coil. <br> (iii) Spilt ring. The function of split rings is to reverse the direction of current flowing through the coil every time the coil passes the vertical position during a revolution.
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Answer:
a)state Fleming's left hand rule
Fleming's left-hand rule states that:
When a current-carrying conductor is placed in an external magnetic field, the conductor experiences a force perpendicular to both the field and to the direction of the current flow. It was invented by John Ambrose Fleming
b.) write principle of working of an electric motor?
The principle of an electric motor is based on the current carrying conductor which produces magnetic field around it. A current carrying conductor is placed perpendicular to the magnetic field so that it experiences a force.
c) i)armature
The main role of an armature is multi purposed. The primary role is to transmit current across the field, therefore generating shaft torque within an active machine otherwise strength in a linear machine. The second role of an armature is to produce an EMF (electromotive force
ii)A brush or carbon brush is an electrical contact which conducts current between stationary wires and moving parts, most commonly in a rotating shaft. Typical applications include electric motors, alternators and electric generators.
iii)Split ring is used for reversing the direction of current in the coil. For the continuous rotation of the coil in the same direction, the current in the coil must be reversed.
