Motors, Generators and Transformers

Question	Answer
5.1 The Motor effect	Electromagnets, Generators and Transformers
Like Poles... Unlike Poles...	Repel Attract
uniform magnetic field	when the lines are parallel the field is uniform.
where, on like and unlike magnet patterns, is the magnetic field uniform.	On like magnets the field is uniform in the centre of the gap. On unlike magnets the field is uniform going away from the magnet ends pointing towards eachother. Image: fa5d4e2f-fbf7-4116-a4e4-5544fcc19ad4 (image/jpeg)
how is a magnetic field produced around a wire?	when a current flows through the wire.
apperance of field around a wire	concentric circles, oerpendicular to the wire. Image: 4470c15e-bedb-4fa0-841a-2fe33c1bf846 (image/jpeg)
how do you reverse the direction of the magnetic field?	reversing current reverses the direction of the magnetic field
Left hand rule	Image: 188249ab-23ee-4ee6-b3e6-49f1aea220e4 (image/jpeg)
How do you make an electromagnet	by wrapping insulated wire around an iron core. When a current flows through the coil, the iron becomes magnetised
Uses of electromagnets	scrapyard cranes, circuit breakers and electric bells.

Resource summary

	Created by liv.hansen99xx over 10 years ago