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### 35 Cards in this Set

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