Chapter 22: Electric motors and electromagnetic induction
- Created by: equirides
- Created on: 18-03-18 19:30
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- When a current is passed through a wire placed in a magnetic field a force is produced which acts on the wire
- Partial accelerators: a force is produced on wires carrying current in a magentic field because the moving charged particles in the wire produce a magnetic effect. Beams of charged particles like electrons or protons can be made to accelerate or change direction (or both) by applying strong magentic fields to them, provided the charged particles are not moving parallel to the magnetic field. This effect is used in high energy particle accelerators like the LHC (large hardon collider) at CERNE and in experiment nuclear fusion reactors
- Motor Rule: the force acting upon the wire will make the wire move. The thumb of your left had may be used to determine the direction of movement caused by the force on the wire. In order to remember what component the direction of the thumb shows remember: thumb shows the direction of movement caused by the force on the wire
- The motor effect is also used in loudspeakers: the signal current produced by an amplifier is alternating and by passing it through a coil in a magnetic field the current results in altering forces on the coil. The coil is attached to a paper cone and this transfers the vibrations to the air
- The size of the force that acts on a current-carrying conductor placed at right angles to a magnetic field may be increased by either increasing the strength of the magnetic field or by increasing the current in the wire
- A DC motor consists of…
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