Permanent Magnet Electromagnet Principles ElectricityElectronics Technology Department Rondout
- Slides: 19
Permanent Magnet & Electromagnet Principles Electricity/Electronics Technology Department Rondout Valley High School
Outline l Permanent Magnets – Poles – Magnetic Fields – Characteristics of Fields – Uses l Electromagnets – How they are created – Magnetic fields – Uses
Permanent Magnets l Holds a magnetic force l Can not be turned on and off l Uses – Frig Magnet – Speakers – Electric Motors – Many more….
Magnetic Poles l Refers to the ends of a permanent magnet, either North or South l Determined by its charge (placement of electrons) Permanent Magnet S N
Magnetic field: l The region around a magnet or currentcarrying body in which magnetic forces are observable Permanent Magnet S N
Repelling Forces l Like S Poles want to repel each other N N Magnetic fields collide and push against each other S
Electromagnets l Use electricity to create a magnetic field l They can be controlled (turned on and off) l Their force or strength of field can be controlled
Electromagnet Basics l Current-Carrying Wire l Needs to have electron flow Electromagnetic Field around a wire
Determining the Direction of the Magnetic field l Left-Hand Rule: – Grasp a wire with your left hand with your thumb pointing in the direction of current flow – Your fingers around the wire point in the direction of the field
Creating a Larger Magnet l Coils – Each loop of coil has a small amount of magnetic pull – When the loops are added together the coil begins to act as a magnet with poles
Electromagnetic Field
Strength of Electromagnets Depends on three main things: l Number of turns in the coil – The more turns in a coil, the stronger the magnet l Amount of current in the coil – If the voltage is increased, so will the current, which will increase the strength of the magnetic field
Strength of Electromagnets(cont. ) l Permeability of the core material – Permeability: The ability of a material to be magnetized, even temporarily, and to transmit magnetic force – Air would make a weak magnet – Iron would make a strong magnet
Putting Electromagnets to Use l Solenoid: – Is an electromagnet with a moveable core called a plunger
Uses for a Solenoid l Electrical l Buzzers l Switches l Locks l Bells Relays
Solenoid Uses
Other uses for Electromagnets l Transformers l Industry l Sensors l Motors
Summary Magnets that hold their magnetic forces and can not be controlled are called_____. 1. • Permanent Magnets 2. Refers to the region around a magnet or current carrying device where magnet forces are observed. – Magnetic Field
Summary (cont. ) 3. How is the direction of a magnetic field determine around a current carrying wire? Left-Hand Rule 4. What three things determine an electromagnet’s strength? – Number of turns – Current through the coil – Permeability of core material
- Temporary vs permanent magnets
- Difference between permanent magnet and temporary magnet
- Besi lunak diletakkan di sekitar magnet
- Blpm dc motor
- Pmac drives
- Brewbaker technology magnet high school
- Electromagnet in speakers
- Oh magnets electromagnet
- Observation of electromagnet
- Equation of electromagnetism
- Magnetism test review
- Electromagnet lab
- Examples of electromagnets
- Magnetic field in a closed loop
- Write a design brief of a crane
- Electromagnet experiment hypothesis
- The student sitting next to you just came
- Currents and magnets summarizer
- What is electromagnet
- Three ways to make an electromagnet stronger