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24 Cards in this Set
- Front
- Back
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What is electricity?
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The flow of electrons
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What is the difference between static electricity and current electricity?
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One is the build up of a charge on the surface of an object;
One is the flow of electrons through a conductor/circuit |
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Three ways you can charge an object: Explain and give example of each.
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Friction - energy being "wiped" from one object to another. Ex - ballon/hair
Conduction-when electrons move from one objeect to another with direct contact. Ex: plastic ruler touches metal rod and the rod becomes charged by conduction. Induction-when charges in an uncharged metal object are rearranged wihout direct contact with a charge object; |
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Why does electric discharge occur?
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Due to a difference in charge;
Build up of negative charges attract to a postively charged object - moving from negative to positive |
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What is an example of electric discharge?
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Lightening
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What is a circuit?
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A complete path through which electrons can move.
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Three Things Needed to Build a Circuit
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Energy Source -- Battery
Conductors -- Wire Load -- Light Bulb |
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Compare/Contrast Series and Parallel Circuits
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1. S - one path for electron flow; PC - More than one path for electron flow.
2. S - Bulbs get dimmer b/c they share same current; PC - Same brightness when more bulbs are added 3. S - when one goes out they all go out; PC - when one goes out only the the bulb on the circuit goes out. |
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What is Resistance?
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Resistance is the opposition to flow and it can create heat in a wire.
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What 2 factors affect resistance in wire?
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Thicker wire has less resistance.
Shorter wire has less resistance. |
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How does voltage affect the current in a circuit?
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The greater the voltage the greater the current.
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What would happen to the brightness of a buld if you were to use a bigger battery?
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Bulb will shine brighter with a larger voltage.
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What material are magnets attracted to?
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Iron
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Where is the magnetic field the strongest?
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At the poles
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What makes a magnet magnetic?
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The arrangement of the atoms inside organized domains.
When domains are aligned poles are fomed and object becomes magnetic. |
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What is a solenoid?
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A coil of wire WITHOUT an iron core. They produce a magnetic field.
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What is an electromagnet?
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A solenoid WITH an iron core.
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How can you make an electromagnet stronger?
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Increase voltage.
Increase number of coils Use larger guage wire Use a better conductor |
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Why are electromagnets useful?
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Can turn them on/off with electricity.
Can increase or decrease the strength of an electromagnet. |
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Example of electromagnets in everyday life?
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Create electric motors.
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What is a conductor?
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It allows heat and electricity to pass through it easily.
There is less resistance in a conductor. |
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An Exmaple of a conductor.
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Metals
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What is an insulator?
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Does not allow heat and electricity to pass through easily.
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Eamples of insulators.
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Wood, plastic, rubber
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