* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download electric current
Friction-plate electromagnetic couplings wikipedia , lookup
Electrostatics wikipedia , lookup
Wireless power transfer wikipedia , lookup
National Electrical Code wikipedia , lookup
Magnetoreception wikipedia , lookup
Three-phase electric power wikipedia , lookup
Residual-current device wikipedia , lookup
Force between magnets wikipedia , lookup
Magnetochemistry wikipedia , lookup
Lorentz force wikipedia , lookup
Electromagnetism wikipedia , lookup
Insulator (electricity) wikipedia , lookup
Superconducting magnet wikipedia , lookup
Multiferroics wikipedia , lookup
Induction heater wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Faraday paradox wikipedia , lookup
Hall effect wikipedia , lookup
Electrical resistance and conductance wikipedia , lookup
Superconductivity wikipedia , lookup
Skin effect wikipedia , lookup
High voltage wikipedia , lookup
Magnetic core wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Electrification wikipedia , lookup
Eddy current wikipedia , lookup
Earthing system wikipedia , lookup
History of electric power transmission wikipedia , lookup
Electromotive force wikipedia , lookup
Electricity wikipedia , lookup
Electric current wikipedia , lookup
Scanning SQUID microscope wikipedia , lookup
Electric machine wikipedia , lookup
Book 2, Chapter 3 Using Electricity and Magnetism Study Guide 1. A galvanometer uses the magnetic force from a current through a loop of wire in a circuit to measure? 2. A commutator is a device that reverses the current through a(n) 3. What is a coil of wire with a current called? 4. A turbine 5. When a wore with a current is placed in a magnetic fireld 6. Alternating current allows efficient electrical energy transmission because 7. What is a current that consists of charges that move back and forth in a circuit? 8. The relationship between electricity and magnetism is called 9. A generator uses motion in a magnetic field 10. Generating an electric current from the motion of a conductor through a magnetic field is called 11. Most electric motors have an arrangement of hundreds of loops of wire wrapped around an iron core. This arrangement is called a(n) ___________________________ 12. An electric generator transforms __________________into electrical energy. 13. A solenoid with a ferromagnetic core is called a(n) ______________________________ 14. The ability to move an object over a distance is called ____________________________ 15. A(n) ___________________________ is a device that increases or decreases voltage. True or false – if false fix 16. A(n) generator transforms electrical energy to mechanical energy. 17. The type of current produced by the battery in a calculator is direct current. 18. The energy associated with electric currents is called mechanical energy. 19. In a transformer, the primary coil is connected to a voltage source. 20. A(n) electric current will be induced in a conductor when the conductor moves through a magnetic field. Diagram – generating plant to transforms to house picture on p 100 21. Which transformed is a step-up transformer? Which is a step-down transformer? How do you know? 22. Which section of the circuit has the greatest voltage? How do you know? 23. What are 3 distinct characteristics of a magnetic field produced by a current? 24. Can a transformer work with direct current? Explain your answer. 25. What causes the pointer to move in a galvanometer? Use the picture to answer 26-27 Picture on page 98 26. Whay type of device is shown in the diagram? Explain how you know what it is. 27. Why wouldn’t this device work? How could you change it to make it work? 28. Contract the current produced by an AC generator and that produced by a battery. 29. Describe four ways you can increases the strength of al electromagnet’s field. 30. Contrast current in an electric motor and a generator.