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35 Cards in this Set
- Front
- Back
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circuit
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A path that is made for an electric current.
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conductor
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A material that current can pass through easily.
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resistor
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A material that resists but doesn't stop the flow of current.
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series circuit
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A circuit that has only one path for current.
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parallel circuit
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A circuit with more than one path for current to travel.
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What is electric current?
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Electric current is a flow of electric charges.
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insulator
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A material that current cannot pass through easily.
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Describe what has to be in place for a circuit to work.
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A path for electric current to travel made up of a conductor, a resistor, or an insulator must be in place for a circuit to work.
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electromagnet
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An arrangement of wire wrapped around a core, producing a temporary magnet.
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frame of reference
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The things around you that you can sense and use to describe motion.
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electric cell
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A battery that supplies energy to move charges through a circuit.
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motion
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A change in position.
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electric current
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A flow of electric charges.
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Contrast conductors and insulators.
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Current easily passes through conductors, but current cannot pass through insulators easily.
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What is a motor?
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A motor contains an electromagnet and a permanent magnet. When the motor is on, the direction of current is chnages in a pattern. As it changes, the coil is pushed and then pulled by the permanent magnet. The coil turns.
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position
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A certain place.
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How can you find the poles of a magnet?
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A magnet's pull is strongest at its poles. You can find the poles by sensing which part of the magnet has the strongest pull.
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magnet
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An object that attracts certain materials, such as iron or steel.
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relative motion
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A motion that is described based on a frame of reference.
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The ends of an electromagnet that are useful are called?
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The ends of an electromagnet that are useful are called poles.
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magnetic field
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The space all around a magnet where the force of the magnet can act.
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What is a magnetic field?
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A magnetic field is the space all around a magnet where the force of the magnet can act.
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speed
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A measure of an object's change in position during a unit of time; for example, 10 meters per second.
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Which type of magnet has a field that is about the same shape as Earth's magnetic field?
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Earth's magnetic field is like the field of a giant bar magnet.
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Name two way that you can make an electromagnet stronger.
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You can make an electromagnet stronger by using a core of iron, or by increasing the number of loops in the electromagnet's coil.
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magnetic pole
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The end of a magnet.
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charge
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A measure of the extra positive or negative particles that an object has.
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static electricity
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The charge that stays on an object.
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How many poles does a magnet have?
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Magnets have two poles, north and south.
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electric field
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The space where electric forces occur around an object.
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What is static electricity?
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Static electricity is a charge that stays on an object.
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What is a charge?
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A charge is a measure of the extra positive or negative particles that an object has.
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What supplies energy in an electric circuit?
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Electric cells supply energy in an electric circuit.
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What is an electric field?
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An electric field is the space where electric forces occur around an object.
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What do magnets and electric charges have in common?
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A current in a wire produces a magnetic field. Compared with bar magnets, current-carrying wires produce weak magnetic fields.
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