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22 Cards in this Set
- Front
- Back
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magnetic force
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the force a magnet exerts on another magnet, on iron or similar metal, or moving charges
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magnetic poles
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regions where the magnet's force is strongest
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magnetic field
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surrounds a magnet and can exert magnetic forces
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magnetic domain
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a region that has a very large number of atoms with aligned magnetic fields
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ferromagnetic material
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can be magnetized because it contains magnetic domains
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describe the interaction of magnetic poles.
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like magnetic poles repel one another; opposite poles attract one another
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what two things can happen to a magnet entering a magnetic field?
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a magnetic field, which is strongest near a pole, will either repel or attract another magnet that enters the field
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what makes a material magnetic?
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when a material is magnetized, most of its magnetic domains are magnetized
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solenoid
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a coil of current-carrying wire that produces a magnetic field
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galvanometer
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a device that uses solenoids to measure small amounts of current
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electric motor
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a device that uses an electromagnet to turn an axle
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besides a magnet, what can create a magnetic field?
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moving electric charges create a magnetic field
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how is the magnetic field of an electromagnet controlled?
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changing the current in an electromagnet controls the strength and direction of its magnetic field
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how are solenoids and electromagnets used in galvanometers, electric motors, and loudspeakers?
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electromagnetic devices such as galvanometers, electric motors, and loud speakers change electric energy into mechanical energy
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electromagnetic conductors
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the process of generating a current by moving an electric conductor into a magnetic field
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generator
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a device that converts mechanical energy into electrical energy by rotating a coil of wire in a magnetic field
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transformer
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a device that increases or decreases the voltage and currentof two linked AC circuits
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turbine
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a device with fanlike blades that turn when pushed.
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how is voltage induced in a conductor?
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voltage is induced in a conductor by a changing magnetic field
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name two types of genetators
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AC and DC generators
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how does a transformer work?
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a transformer changes voltage and current by inducing a changing electric field in one coil. this changing field then induces an AC in a nearby coil with a different number of turns
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name six sources of electrical energy n the US
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coal, water, nuclear, wind, natural gas, and petroleum
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