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Permanent Magnet & Electromagnet Principles Electricity/Electronics Technology Department Rondout Valley High School.

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Presentation on theme: "Permanent Magnet & Electromagnet Principles Electricity/Electronics Technology Department Rondout Valley High School."— Presentation transcript:

1 Permanent Magnet & Electromagnet Principles Electricity/Electronics Technology Department Rondout Valley High School

2 Outline Permanent Magnets – Poles – Magnetic Fields – Characteristics of Fields – Uses Electromagnets – How they are created – Magnetic fields – Uses

3 Permanent Magnets Holds a magnetic force Can not be turned on and off Uses – Frig Magnet – Speakers – Electric Motors – Many more….

4 Magnetic Poles Refers to the ends of a permanent magnet, either North or South Determined by its charge (placement of electrons) S N Permanent Magnet

5 Magnetic field: The region around a magnet or current- carrying body in which magnetic forces are observable S N Permanent Magnet

6 Repelling Forces Like Poles want to repel each other S N N S Magnetic fields collide and push against each other

7 Electromagnets Use electricity to create a magnetic field They can be controlled (turned on and off) Their force or strength of field can be controlled

8 Electromagnet Basics Current-Carrying Wire Needs to have electron flow Electromagnetic Field around a wire

9 Determining the Direction of the Magnetic field 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

10 Creating a Larger Magnet 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

11 Electromagnetic Field

12 Strength of Electromagnets Depends on three main things: Number of turns in the coil – The more turns in a coil, the stronger the magnet Amount of current in the coil – If the voltage is increased, so will the current,which will increase the strength of the magnetic field

13 Strength of Electromagnets(cont.) 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

14 Putting Electromagnets to Use Solenoid: – Is an electromagnet with a moveable core called a plunger

15 Uses for a Solenoid Electrical Relays Buzzers Switches Locks Bells

16 Solenoid Uses

17 Other uses for Electromagnets Transformers Industry Sensors Motors

18 Summary 1. Magnets that hold their magnetic forces and can not be controlled are called__________. Permanent Magnets 2. Refers to the region around a magnet or current carrying device where magnet forces are observed. – Magnetic Field

19 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


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