Term
| What is an electric current? What are the two types of current? |
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Definition
| the flow of charge; AC and DC |
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Term
| What does AC mean? HOw does it move? |
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Definition
| alternating current; moves back and forth |
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Term
| What does DC mean? HOw does it move? |
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Definition
| direct current; moves in the same direction |
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Term
| What is the unit for current? What is the symbol for current? |
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Definition
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Term
| What is electric potential? |
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Definition
| the difference in potential energy between two points |
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Term
| What are other names for electric potential? |
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Definition
| potential difference, potential drop, EMF, voltage |
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Term
| What is the unit for electric potential? |
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Definition
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Term
| What are fives sources of electric potential? |
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Definition
| electromagnetic induction, photoelectric effect, thermoelectric, piezoelectric, chemical effect |
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Term
| What type of energy is converted in electromagnetic induction? What is an example of something that uses electromagnetic induction? |
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Definition
| mechanical energy converted to electrical energy; example is a generator |
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Term
| What type of energy conversion takes place in the photoelectric effect? |
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Definition
| light energy to electricity |
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Term
| What type of energy conversion takes place in the thermoelectric effect? |
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Definition
| heat is converted to electricity |
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Term
| What type of energy conversion takes place in the piezoelectirc effect? |
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Definition
| mechanical energy to electricity |
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Term
| What type of energy conversion takes place in the chemical effect? |
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Definition
| chemical energy to electric |
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Term
| What is an example of the piezoelectric effect? |
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Definition
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Term
| practice voltage and current drawings (batteries) |
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Definition
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Term
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Definition
| loss of energy or opposition to current |
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Term
| What are four factors that affect the resistance? |
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Definition
| length, area, resitivity, temperature |
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Term
| What is the unit for resistance? |
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Definition
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Term
| How does the length of the wire affect the resistance? |
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Definition
| the longer the wire, the more resistance |
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Term
| How does area affect resistance? |
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Definition
| the more area, the less resistance |
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Term
| How does the resitivity affect resistance? |
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Definition
| the lower the resitivity, the better conductor |
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Term
| HOw does temperature affect resistance? |
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Definition
| as temperature increases, resistance also increases |
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Term
| What is the equation to calculate the resistance of a piece of wire? |
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Definition
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Term
| How do you read the resistance of a resistor? |
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Definition
| look at the colors--do not add the numbers, just put them together and multiply by the third number |
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Term
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Definition
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Term
| The smaller the wire the, ____resistance. |
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Definition
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Term
| What are three things you must have for a circuit? |
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Definition
| source of voltage (EMF), conductors to complete the pathway, load |
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Term
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Definition
| something that is being run by the circuit |
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Term
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Definition
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Term
| How do you calculate electrical power? |
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Definition
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Term
| How do you calculate electrical energy? |
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Definition
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Term
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Definition
| a unit of energy equal to the work done by a power of 1000 watts operating for one hour |
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Term
| How do you calculate cost? |
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Definition
| cost = energy x rate (energy is in kilowatt hours) |
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Term
| Which way do electrons flow in conductors? |
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Definition
| from negative to positive |
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Term
| Which way does conventional current flow? |
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Definition
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Term
| One coulomb is equal to how many electrons? |
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Definition
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Term
| sample problem one on review sheet |
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Definition
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Term
| If electrons are moving north, in which direction is the current moving? |
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Definition
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Term
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Definition
| the speed of the electrons (very slow) |
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Term
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Definition
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Term
| What is the symbol for a cell? |
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Definition
| short line is a cathode (-); long line is an anode (+) |
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Term
| When cells are connected in a series, what increases? |
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Definition
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Term
| When cells are connected in parallel, what increases? |
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Definition
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Term
| What is resitivity? What is the symbol? |
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Definition
| measure of the resistance per length; symbol is p (rho) |
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Term
| The number of charges passing a point in a second is called the _____ |
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Definition
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Term
| What causes charge to flow? |
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Definition
| voltage or potential difference |
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Term
| If the length of wire increases what happens to the resistance? |
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Definition
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Term
| IF the width of the wire increases, what happens to the resistance? |
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Definition
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