DIRECT CURRENT CIRCUITS ANSWERS

DIRECT CURRENT CIRCUITS ANSWERS - -1-PHYSICS...

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Unformatted text preview: -1-PHYSICS 212DIRECT-CURRENT CIRCUITSWORKBOOKANSWERS-2-PHYSICS 212 OUTLINEDIRECT-CURRENT CIRCUITS1 SOURCES OF EMFWhat does the abbreviation emf represent?electromotive forceExplain the difference between a batterys emf and its terminal voltage.The battery emf is the voltage produced internally.The terminal voltage is the accessible external voltage.2RESISTORS IN SERIESDraw a simple circuit with two resistors in series.How are the currents through the two resistors related?The currents through the resistors is the same through both.How are the voltages across the two resistors related?The voltages add together to equal the voltage across their group, in this case thebattery voltage.How is the equivalent resistor calculated?The equivalent resistor is the sum of the individual resistors in series.3RESISTORS IN PARALLELDraw a simple circuit with two resistors in parallel.-3-How are the currents through the two resistors related?The currents through the resistors adds together and equals the current entering thegroup .How are the voltages across the two resistors related?The voltages across the resistors are equal.How is the equivalent resistor calculated?The reciprocal of the equivalent resistor is equal to the sum of the reciprocal of allthe resistors in parallel.4RC CIRCUITSSuppose a capacitor and resistor are connected in series. During the charging process I, Q, and VCchange. Write equations for these quantities.11tRCtRCtRCII eQQeVVe== = What is the RC time constant?It is the it takes the current from a discharging capacitor to fall to 1/e of its in initialvalue.When a capacitor discharges through a resistor I, Q, and VCchange. Write equations for thesequantities.tRCtRCtRCII eQQ eVV e===-4-5HOUSEHOLD CIRCUITSHow is 240 V produced in circuits for large appliances?The appliance is connected between two wires, one is 120 V above ground and theother is 120 V below ground.6ELECTRICAL SAFETYList what may likely occur for each of the following currents if passing through a person.5 mA - sensation of shock, usually no damage or harm10 mA - muscle contraction and possible inability to let go of wire100 mA - potentially fatalWhat does the abbreviation GFI represent and how does the device work?Ground-Fault Interrupt -5-PHYSICS 212 MULTIPLE CHOICE QUESTIONSDIRECT-CURRENT CIRCUITSMultiple ChoiceIdentify the letter of the choice that best completes the statement or answers the question.C___1. The two ends of a 3.0-resistor are connected to a 9.0-V battery. What is the current through the resistor?...
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This note was uploaded on 04/07/2009 for the course PHY 212 taught by Professor Dayton during the Spring '09 term at American International.

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DIRECT CURRENT CIRCUITS ANSWERS - -1-PHYSICS...

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