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Electric Current and Ohms Law

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Electric Current The continuous flow of electric charge –The two types of current are direct current (DC) and alternating current (AC)

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Voltage Potential difference: the difference in electrical –Measured in Volts (v)

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In order for charge to flow in a conducting wire, the wire must be connected in a complete loop that includes a source of electrical energy

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Ohm’s Law The Voltage in a circuit equals the product of the current (I) and resistance (R) –V=I x R or I = V R I- amperes R - ohms

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Practice Problem What is the voltage if the resistance is 3 ohms and the current is 3 amps?

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More Practice Problems What is the current if there is 10 volts, and 4 ohms of resistance? What is the resistance if there is 12 volts and 6 amps of current? What is the voltage if there is 4.5 amps and 6 ohms of resistance?

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Increasing the voltage increases the current. Keeping the same voltage and increasing the resistance decreases the current.

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Electric Circuit A complete path through which charge can flow.

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Circuit diagrams se symbols to represent parts of a circuit, including a source of energy and devices that are run by electrical energy. –Switches can show if the circuit is open or closed

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Series Circuits Charge has only one path through which it can flow

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If one element stops functioning in a series circuit, none of the elements can operate. Example: christmas lights

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Parallel Circuit An electrical circuit with two or more paths through which charges can flow

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If one element stops functioning in a parallel circuit, the rest of the elements still can operate. Ex. Light bulbs in your house

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Catalyst If I have a battery that can output 120 volts and a resistance of 30 ohms, what is the current that is able to flow through the circuit?

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Electric Power The rate at which electrical energy is converted to another form of energy –Measured in Joule/second or Watt

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P(watts) = I (amps) x V (volts)

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Practice Problems An electric oven is connected to a 240-volt line, and it uses 34 amps of current. What is the power used by the oven?

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More Practice Problems Every Time you use a 1875- watt hair dryer, you send through a current of 35 amps. What is the voltage used by the hair dryer? If you are using 250 volts and a power of 2500 watts, what is the current that runs through the circuit?

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More practice problems 1-3 on page 611 7-8 on page 613

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Online practice http://www.wisc- online.com/objects/index_tj.asp?objID=dc e11904

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http://www.allaboutcircuits.com/worksheet s/ewp.html

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