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21 Electromagnetism
Electromagnetism Ch. 21 Prentice Hall Science Explorer
| Question | Answer |
|---|---|
| electromagnetism | the relationship between electricity and magnetism. An electric current produces a magnetic field. |
| solenoid | a coil of wire with a current that acts as a bar magnet. The more coils or the tighter the coils, the stronger. |
| electromagnet | a magnet created by wrapping a coil of wire with a current around a ferromagnetic core. A strong magnet that can be turned on and off. |
| energy | the ability to do work or cause change |
| electrical energy | the energy of moving electrical charges |
| mechanical energy | kinetic or potential energy associated with the motion or position of an object |
| galvanometer | a device that uses an electromagnet to detect small amounts of current |
| electric motor | a device that transforms electrical energy to mechanical energy |
| electromagnetic induction | the process of generating an electric current from the motion of a conductor through a magnetic field |
| direct current | current consisting of charges that flow in only one direction in a circuit. flash light |
| alternating current | current consisting of charges that move back and forth in a circuit. Used in homes and schools because it is safer. Why? |
| electric generator | a device that converts mechanical energy into electrical energy |
| turbine | a large circular device with many blades - sometimes used to transform mechanical energy into electrical energy |
| transformer | a device that increases or decreases voltage |
| step-up transformer | a tranformer that incereases voltage by wrapping more coils on the outgoing side of the magnet. |
| step-down transformer | a transformer that decresases voltage by wrapping more coils around the incoming side of the magnet. |
| sound | Energy you hear produced by the friction of an electric wire, motor ..It produces inefficiency because it is wasted energy |
| thermal energy | Heat energy produced by the friction of an electric wire, motor ..It produced inefficiency because it is wasted energy. |
| wasted energy | In a motor or other energy transformations, sound and thermal energy are called ___ because the energy does not do work as intended (make the car move). |
| magnetic field | The ___ produced by an electric current has three distinct characteristics. The field can be turned on and off, have its direction reversed, and have its strength changed. |
| with a current | When a wire ___ is placed in a magnetic field, the electrical energy is transformed in to mechanical energy. |
| induced current | Current that is generated by moving a conductor through a magnetic field is called ____. |
| higher or lower | Alternating current is safer than direct currents because the voltage can be made ___ |
| brighter | If I add lights to a parallel circuit, the bulbs get ___ because of less resistance. |
| dimmer | If I add lights to a series circuit, the bulbs get ___ because of more resistance. |
| moving or on | A magnetic force only acts on a electric wire when the electric current is ____. |
| element | If I open a box that is full of only one type molecule and all the molecules look the same and have only one type of atom, I have a ____ |
| compound | If I open a box that is full of only one type molecule and there is more than one type atom in each molecule, I have a ____. |
| does not | On a horizontal line, what happens to the temperature, ___ change as it melts from a solid to a liquid. |
| equally (silly) | If the strongest magnet in the world exerts a force on a tiny paper clip, the paper clip exerts a force that is stronger or weaker? |
| perpindicular | In an EM wave the electric field and magnetic field move in unison but at 90 degree angles or ____ to each other. |
| force | A force transforms energy from one form to another and moves it from one object to another. |
| friction | ___ is NOT A FORM OF ENERGY!! It has the (F) word so it is a form of Friction. It is F not E!!! |
Created by:
aubiefan
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