Electromagnets

Jack Milligan
Mind Map by Jack Milligan, updated more than 1 year ago
Jack Milligan
Created by Jack Milligan over 4 years ago
7
0

Description

JACK MILLIGAN

Resource summary

Electromagnets
  1. Right hand grip rule
    1. Grab the wire with the right fist, thumb pointing up or down depending on current. (+ to -)
      1. Curled finger direction shows direction of the magnetic field
        1. Thumb shows direction of current
        2. Flemings left hand rule
          1. Forefinger points to Field (N to S)
            1. thuMb points to Movement
              1. seCond finger points to Current
              2. Motor Effect
                1. When a current flows in a magnetic field it will produce MOTION
                  1. A magnetic field is created when an electric current flows through a wire. Electromagnets have strong magnetic fields due to the coiling of wire around a soft iron core. . When a magnetic field from a wire is placed into another magnetic field, it causes the wire to move. This principle is utilised in electric motors and loudspeakers.
                    1. Electromagnets are used in many appliances including electric bells and relay switches
                    2. Strength of an elctromagnet increases when -
                      1. More coils
                        1. Larger current
                          1. Stronger magnets
                          2. Electromagnetic Induction
                            1. If we move a conductor in a magnetic field we will produce a current
                              1. 1. Wire is moved through magentic field
                                1. 2. This causes an electromagnetic field to be induced into the wire
                                  1. 3. The EMF induces a current in the wire
                                    1. 4. The current proiduces a magnetic filed which causes a 'drag' force in the wire in the opposite direction to the original motion.
                              2. Transformer Calculations
                                1. Transformers
                                  1. Step up
                                    1. More coiuls in secondary,
                                      1. Increase voltage, decreases current
                                      2. Step down
                                        1. less coils in secondary
                                          1. Decreases voltage, increase current
                                        Show full summary Hide full summary

                                        Similar

                                        AQA Physics P1 Quiz
                                        Bella Statham
                                        Using GoConqr to study science
                                        Sarah Egan
                                        GCSE AQA Physics - Unit 3
                                        James Jolliffe
                                        GCSE AQA Physics 1 Energy & Efficiency
                                        Lilac Potato
                                        Waves
                                        kate.siena
                                        Forces and their effects
                                        kate.siena
                                        Junior Cert Physics formulas
                                        Sarah Egan
                                        Forces and motion
                                        Catarina Borges
                                        OCR Physics P4 Revision
                                        Dan Allibone
                                        P2 Radioactivity and Stars
                                        dfreeman
                                        Physics P1
                                        themomentisover