Magnets
- Created by: tljg
- Created on: 08-12-15 19:35
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- Magnets
- Object which produces a magnetic field.
- A magnetic field is an area of space where magnetic materials feel a force.
- North & South pole.
- Opposites attract (N&S / S&N).
- Similar poles repel (N&N / S&S).
- Always points from north to south.
- 3 Magnetic elements; Iron (steel) Nickel Cobalt
- Object which produces a magnetic field.
- Methods to show the Magnetic field.
- Place a magnet on a sheet of paper and place a plotting compass at five points at either end of the magnet. Follow the points in the direction of the arrow and join the points.
- Place two magnets 5cm apart underneath a sheet of paper (Repelling / Attracting). Sprinkle iron fillings on the sheet of paper The pattern of the fillings will show the magnetic field
- Electromagnets
- Produce a magnetic field around the wire
- The field produced is weak but can be made stronger by putting magnets together
- Flemmings left hand rule
- You can change the direction of the force by reversing the magnetic field
- HOW CAN WE MAKE THE FORCE BIGGER?
- Use a larger current
- Use a stronger magnet
- Use more wire
- HAND RULE
- ThuMb = Motion
- First Finger = magnetic Field
- SeCond finger = Current
- The electric motor
- Split ring communicator
- Switches the direction of the current so the motor continues to turn in the same direction
- Electrical energy to kinetic energy
- Split ring communicator
- Generators
- KInetic energy to electrical energy
- Needs a magnet, a coil of wire and one needs to be moving.
- The current produced is alternating
- HOW DO YOU MAKE THE VOLTAGE PRODUCED AS BIG AS POSSIBLE?
- More kinetic energy in = More electrical energy out
- Increase the number of coils in the wire
- Increase the size of the coils
- Increase the strength of the magnet
- Use a magnetic material as the core
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