Term
Be able to compare and contrast:
loudspeaker and microphone
generator and motor
permanent magnets and electromagnets |
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Definition
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Term
| How could you labeled some unmarked bar magnets if you only had one bar magnet with a north and south pole marked? |
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Definition
| If a side attracts to the marked north side, it must be south on the other magnet. If it repels the marked north side, it must also be north. [answer can use marked south side as well] |
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Term
| T or F: A compass needle uses an electromagnet. |
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Definition
| False, a compass needle is a thin magnet |
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Term
| T or F: All metals are magnetic. |
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Definition
| False, most metals are magnetic |
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Term
| T or F: An electromagnet gets weaker if you wrap wire around the core more times. |
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Definition
| false, the electromagnet gets stronger if you wrap wire around the core more times |
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Term
| T or F: Earth has two north poles and two south poles. |
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Definition
| true, they are called the geographic and magnetic poles |
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Term
| T or F: Energy that can be sent long distances to a location is called general current. |
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Definition
| False, energy that can be sent long distance is alternating current |
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Term
| T or F: Magnetic force gets weaker as you move objects away from each other. |
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Definition
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Term
| T or F: The Earth is a giant magnet. |
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Definition
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Term
| T or F: The poles of a magnet have strongest attraction when they are alike and close together. |
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Definition
| False, the poles are strongest when they are unlike and close together |
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Term
| T or F: You can increase the strength of an electromagnet by adding more current and less turns of wire. |
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Definition
| False, you can increase strength by adding more current and more turns of wire |
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Term
| What are some things that could cause a loudspeaker to stop working? How could it be fixed? |
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Definition
Not plugged in - plug it in.
Diaphragm is cracked - replace it.
A wire is broken - replace it. |
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Term
| Which 3 of these do not contain electromagnets? [generators, speakers, magnetic fields, motors, and compasses, iron cores] |
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Definition
| Magnetic fields, compasses, and iron cores do not contain electromagnets. |
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Term
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Definition
| flows in one direction and then flows in the opposite direction |
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Term
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Definition
| instrument or tool that uses Earth's magnetic field to help people find DIRECTIONS |
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Term
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Definition
| part of the loudspeaker that VIBRATES to create sound |
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Term
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Definition
| current that flows in one direction |
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Term
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Definition
| COIL of wire wrapped around an iron core |
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Term
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Definition
| device that changes motion INTO ELECTRICAL ENERGY |
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Term
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Definition
| device that changes electrical energy INTO SOUND |
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Term
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Definition
| any OBJECT with magnetic force |
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Term
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Definition
| the AREA of magnetic force around a magnet |
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Term
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Definition
| device that changes sound INTO ELECTRICAL SIGNALS |
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Term
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Definition
| device that changes electrical energy INTO MECHANICAL ENERGY |
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Term
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Definition
| PARTS of a magnet where the magnetic force is strongest |
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Term
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Definition
| ROD that can spin and move |
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Term
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Definition
| lasting for only a short period of time |
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