Science
Forces & Motion
Conceptual
13–14 yrs
Motors & the Motor Effect
电动机与电动机效应
Description
Explain the motor effect as the force on a current-carrying conductor in a magnetic field, and describe how this principle is used in electric motors and loudspeakers
Mastery Evidence
- Explains that a current-carrying conductor in a magnetic field experiences a force (the motor effect)
- Predicts how reversing the current or reversing the magnetic field affects the direction of the force
- Describes how the motor effect is applied in an electric motor and in a loudspeaker
Assessment Prompt
If your child looked inside an electric motor or the back of a loudspeaker, could they explain why the coil of wire moves — and what would happen to the movement if you reversed the direction of the current?
Prerequisites 1
Electromagnets
电动效应（磁场中载流导体所受的力）是电磁学的应用——需要同时掌握磁场和电流产生磁场的知识
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