* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download SUMMARY 1. Define motor and generator. A motor is a device
Magnetic stripe card wikipedia , lookup
Casimir effect wikipedia , lookup
Friction-plate electromagnetic couplings wikipedia , lookup
Neutron magnetic moment wikipedia , lookup
Magnetometer wikipedia , lookup
Earth's magnetic field wikipedia , lookup
Magnetic monopole wikipedia , lookup
Giant magnetoresistance wikipedia , lookup
Electromagnetic field wikipedia , lookup
Skin effect wikipedia , lookup
Magnetotactic bacteria wikipedia , lookup
Electrical resistance and conductance wikipedia , lookup
Magnetotellurics wikipedia , lookup
Electricity wikipedia , lookup
Multiferroics wikipedia , lookup
Magnetoreception wikipedia , lookup
Electromagnetism wikipedia , lookup
History of electrochemistry wikipedia , lookup
Electromotive force wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Magnetochemistry wikipedia , lookup
Superconducting magnet wikipedia , lookup
Electric machine wikipedia , lookup
Force between magnets wikipedia , lookup
Ferromagnetism wikipedia , lookup
Eddy current wikipedia , lookup
Electromagnet wikipedia , lookup
SUMMARY 1. Define motor and generator. A motor is a device which converts electrical energy to mechanical energy (or motion). A generator is a device which converts mechanical energy into electrical energy. 2. What does the term “magnetic field” describe? The region surrounding a magnet where magnetic effects can be detected. A compass needle or an iron/steel object experiences a force in a magnetic field. A magnetic field is a pattern of magnetic vectors. 3. The Right Hand Rule for Motors allows the 3-dimensional application of three mutually perpendicular effects – what are they? 1) The magnetic vectors, 2) the direction the charge is moving, and 3) the resulting force on the wire. 4. How are the Right Hand Rules for Motors and Generators alike? They each depend on three mutually perpendicular factors: magnetic vectors, moving charge and force on the charge in the wire. 5. How are the Right Hand Rules for Motors and Generators different? They differ in their cause and effect and are opposites of each other. Cause MOTOR: Charges moving through Sideways force on charges a wire near a magnet, makes wire move; motor while a battery is attached turns GENERATOR: Wire moving near a magnet, while the crank is being turned PASCO scientific Effect Sideways force makes charges move through wire Teachers Resource Guide T-288 6. It may feel very difficult to crank a generator when it is attached to a very low resistance circuit. Explain this apparent contradiction. See Activity 7.17. The pressure difference created by cranking the Genecon in a low resistance circuit generates more current. More current through the Genecon’s coils will cause a stronger force opposing rotation, making it harder to crank the Genecon. 7. In some situations, the motor effect and the generator effect can occur simultaneously. Cite at least one example. See Activity 7.17 and 7.20. A Genecon placed in a circuit behaves as a motor as current moves through it. As its crank is turning, however, it is also acting as a generator which is producing opposing current. PASCO scientific Teachers Resource Guide T-289