Term
| Name three kinds of electric charges. |
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Definition
| Positive, negative and neutral/no charge. |
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Term
| What type of charges attract? |
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Definition
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Term
| What type of charges repel? |
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Definition
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Term
| What type of resistance does a conductor have? |
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Definition
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Term
| What type of resistance does an insulator have? |
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Definition
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Term
| What is potential difference measured in? |
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Definition
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Term
| What is electric current? |
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Definition
| Electric current is the rate at which electricity flows through a wire. |
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Term
| What is electric current measured in? |
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Definition
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Term
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Definition
| Internal friction causes resistance. |
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Term
| What does resistance do to charges going through objects? |
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Definition
| Resistance slows the movement of the charges. |
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Term
| What is the difference of currents? |
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Definition
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Term
| What is the resistance equation? |
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Definition
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Term
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Definition
| A semiconductor is a material that has both conducting and insulating properties. |
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Term
| How do semiconductors act in their pure state? |
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Definition
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Term
| What do impurities in semiconductors do? |
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Definition
| They increase it's conducting abilities. |
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Term
| What are some well known semiconductors? |
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Definition
| Silicon and geranium are two common semiconductors. |
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Term
| What is a series circuit? |
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Definition
| It is a circuit in which the paths are joined one after another such that the current in each part is the same and have a single path for current, voltage can be different because resistance can be different |
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Term
| What is a parallel circuit? |
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Definition
| It is a circuit in which the paths are joined in branches such that the potential differences across each part id the same and have multiple paths for currents, the current for each does not have to be the same |
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Term
| What is the electric power equation? |
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Definition
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Term
| What is the function of fuses and circuit breakers? |
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Definition
| They are safety devices that prevent overloads in electric devices. |
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Term
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Definition
| A fuse is an electric device that contains a metal strip that melts when current in the circuit becomes to great. |
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Term
| What is a circuit breaker? |
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Definition
| A circuit breaker is a switch that opens a circuit automatically when the current exceeds a certain value, uses a bimetallic strip or magnet that responds to current overload |
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Term
| Where on a magnet is the magnetic force strongest? |
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Definition
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Term
True or False:
All magnets have at least one North and South pole. |
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Definition
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Term
| What is a magnetic field? |
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Definition
| A region where magnetic force can be detected. |
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Term
| What do magnetic field lines represent? |
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Definition
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Term
True or False:
The closer the electric and magnetic field lines, the stronger the magnetic field |
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Definition
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Term
| What do magnetic field lines always form? |
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Definition
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Term
| Where do Earth's field lines run from? |
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Definition
| From geographical North to geographical South. |
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Term
| What two properties do all fields have? |
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Definition
| A direction and a strength. |
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Term
| What is the Right-Hand Rule? |
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Definition
| Rule: if you hold a wire in your right hand and point your thumb in the direction of the positive current, the direction that your fingers curl is the direction of the magnetic field |
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Term
| How do you create an electromagnet? |
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Definition
| By passing a current through a wire wrapped around a piece of iron which creates a magnetic field in the iron rod. |
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Term
| What do both generators and electric motors do? |
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Definition
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Term
| What does a generator specifically do? |
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Definition
| A generator turns mechanical energy into electrical energy. |
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Term
| What does an electric motor specifically do? |
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Definition
| An electric motor turns electrical energy into mechanical energy. |
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Term
| Describe electromagnetic induction. |
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Definition
| Electromagnetic induction is when a current is created by changing magnetic fields. |
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Term
| What is an alternating current/AC? |
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Definition
| A current that is constantly changing from a negative to a positive charge. |
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Term
| What is a direct current/DC? |
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Definition
| The charge is always the same. |
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Term
| How does the loop move in an AC? |
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Definition
| For each half rotation on the loop the current that changes direction at regular intervals. |
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Term
| When the loops are perpendicular to the field what is the current? |
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Definition
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Term
| How does a transformer work? |
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Definition
| It works by having the primary coil induce a magnetic field causing a different voltage to be created in the secondary coil. |
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Term
| More coils in the secondary circuit=? |
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Definition
| Increased voltage and vice-versa. |
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