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Electricity and Magnetism Test
Terms in this set (40)
the accumulation of excess electric charge on an object.
law of conservation of charge
states that charge can be transferred from one object to another but cannot be created or destroyed.
a region surrounding every electric charge in which a force of attraction or repulsion is exerted on other electric charges.
material, such as copper wire, through which electrons can move easily.
material in which electrons and thermal energy are not able to move easily.
charging by contact
the transferring of electrical charge between objects by touching or rubbing.
charging by induction
the rearranging of electrons on a neutral object caused by bringing a charged object close to it.
a device, sometimes consisting of two leaves of metallic foil, used to detect electric charge.
the net movement of electric charges in a single direction, measured in amperes (A)
related to the force that causes electric charges to flow; measured in volts (V)
a closed path that electric current follows.
tendency for a material to oppose electron flow and to convert electrical energy into other forms of energy, such as thermal energy and light; measured in ohms.
states that the current in a circuit equals the voltage difference divided by the resistance.
circuit in which electric current has only one path to follow.
circuit in which electric current has more than one path to follow.
rate at which electrical energy is converted to another form of energy; expressed in watts (W).
example of conductors
metals, door knob, aliminum
example of insulators
glass, plastic, wood
voltage difference formula
electrical power formula
voltage difference formula
the properties and interactions of magnets
region surrounding a magnet that exerts a force on other magnets and objects made of magnetic materials.
region on a magnet where the magnetic force exerted by a magnet is strongest; like poles repel and opposite poles-attract.
group of atoms in a magnetic material in which the magnetic poles of the atoms are aligned in the same direction
the attractive or repulsive force between electric charges and magnets
the interaction between electric charges and magnets.
a cylindrical coil of wire, used to produce a magnetic field when an electrical current passes through the wire.
temporary magnet created when there is a current in a wire coil
a device that uses an electromagnet to measure electric current.(p. 213)
device that converts electrical energy to mechanical energy by using the magnetic forces between an electromagnet and a permanent magnet to make a shaft rotate.
process by which electric current is produced in a wire loop by a changing magnetic field.
device that uses electromagnetic induction to convert mechanical energy to electrical energy.
large wheel that rotates when pushed by steam, wind, or water and provides mechanical energy to a generator.
direct current (DC)
electric current that flows in only one direction
alternating current (AC)
electric current that reverses its direction of flow in a regular pattern.
device that uses electromagnetic induction to increase or decrease the voltage of an alternating current.
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