magnets electricity and energy
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19 terms
Terms | Definitions |
|---|---|
 static and current electricity | Electric charge that has accumulated on an object. Static electricity is often created when two objects that are not good electrical conductors are rubbed together, and electrons from one of the objects rub off onto the other.a flow of electric charge |
| insulators and conductors | A material or an object that does not easily allow heat, electricity, light, or sound to pass through it. A material or an object that conducts heat, electricity, light, or sound. |
| sources of electrical power | solar power wind power carbon oil natrul gas |
| batteries and dry cells | Two or more connected cells that produce a direct current by converting chemical energy to electrical energy. A voltage-generating cell having an electrolyte in the form of moist paste. |
| magnetic fields and poles | A condition found in the region around a magnet or an electric current, characterized by the existence of a detectable magnetic force at every point in the region and by the existence of magnetic poles.the two points in the opposite polar regions of the earth at which the direction of the dipping needle is vertical. |
| how electricity gets to our homes | it comes through power lines |
| types of circuits | Path that transmits electric current. A circuit includes a battery or a generator that gives energy to the charged particles; devices that use current, such as lamps, motors, or electronic computers; and connecting wires or transmission lines. Circuits can be classified according to the type of current they carry (see alternating current, direct current) or according to whether the current remains whole (series) or divides to flow through several branches simultaneously (parallel). |
| using electricity safely | don't touch the plugs while they are plugged in |
| magnets and magnetic attraction | An object that is surrounded by a magnetic field and that has the property, either natural or induced, of attracting iron or steel. attraction for iron; associated with electric currents as well as magnets; characterized by fields of force |
| uses of electromagnets | Without electromagnets, we won't have electricity to power up your home and your computer!! they help us in scrapyards because if we use permanent magnets we wont be able to turn off the magnetism |
| production of electricity | A generator manufactures electricity. In a generator, something causes the shaft and armature to spin. An electric current is generated |
| magnets and compasses | An object that is surrounded by a magnetic field and that has the property, either natural or induced, of attracting iron or steel is a navigational instrument that measures directions in a frame of reference that is stationary relative to the surface of the earth. |
| electromagnetic wave types | a wave is a disturbance (an oscillation) that travels through space and time, accompanied by the transfer of energy. Waves travel and the wave motion transfers energy from one point to another, often with no permanent displacement of the particles of the medium—that is, with little or no associated mass transport. They consist, instead, of oscillations or vibrations around almost fixed locations. |
| energy sources renewable | Renewable energy is energy which comes from natural resources such as sunlight, wind, rain, tides, and geothermal heat, which are renewable (naturally replenished). |
| energy sources nonrenewable | A non-renewable resource is a natural resource which cannot be produced, grown, generated, or used on a scale which can sustain its consumption rate, once depleted there is no more available for future needs. |
| lodestone | a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically |
| positive and negative charge | a physical property of matter that causes it to experience a force when near other electrically charged matter. Electric charge comes in two types, called positive and negative. Two positively charged substances, or objects, experience a mutual repulsive force, as do two negatively charged objects. Positively charged objects and negatively charged objects experience an attractive force. |
| photovoltaic cell | a cell that converts solar energy into electrical energy |
| greenhouse effect | process in which carbon dioxide and other gases in the atmosphere absorb infrared radiation from the sun,farming a "heat blanket" around the earth. |
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