CURRENT AND RESISTANCE ANSWERS

CURRENT AND RESISTANCE ANSWERS - -1-PHYSICS 212CURRENT AND...

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Unformatted text preview: -1-PHYSICS 212CURRENT AND RESISTANCEWORKBOOK ANSWERS-2-PHYSICS 212 OUTLINECURRENT AND RESISTANCE1ELECTRIC CURRENTDefine electric current:Electric current is the flow of electric charge.What is meant by the phrase conventional current?The net flow or effective flow of positive charge.2A MICROSCOPIC VIEW: CURRENT AND DRIFT SPEEDDescribe how charges move in a conductor in electrostatic equilibrium.Electric charges in electric equilibrium do not move.Describe how charges move in a conductor when an electric field is present.Negative charges move in the opposite direction of the electric field in a slow driftdue to the presence of stationary, positive nuclei.Give an approximate value for the drift speed of electrons in a conducting wire?10-4m/s3CURRENT AND VOLTAGE MEASUREMENTS IN CIRCUITSWhat meter is used to measure current?AmmeterWhat meter is used to measure voltage differences?Voltmeter-3-Draw a circuit diagram showing how these two meters would be connected to measure the currentthrough and the voltage drop across a resistor.What are the SI units of current and voltage drop?Current - Amp (A) Voltage Drop - Volt (V)4RESISTANCE AND OHMS LAWWhat is resistance?Resistance is the ability to oppose, reduce and limit the flow of charge.What is a resistor?A resistor is a device whose main property is resistance.How are the quantities I, V, and Rrelated? Write an equation? What is this relation called?Ohms law: VIR=5 RESISTIVITYList and define all the factors that contribute to the value of a resistors resistance. Its length, cross-sectional area, and resistivity.What are the SI units of resistivity?m-4-6 ELECTRICAL ENERGY AND POWERDefine the physical quantity power?The rate at which energy is used or transformed.How is energy supplied to a circuit?Energy is supplied by an electromotive force, emf.How is the rate of energy supplied calculated?suppliedPI=How is energy consumed by a circuit?Energy is lost by the circuit as current passes through resistance.How is the rate of energy consumed calculated?2LostPI R=Explain what is meant by the unit Kilowatt@Hour.This is a unit of energy.-5-PHYSICS 212 MULTIPLE CHOICE QUESTIONSCURRENT AND RESISTANCEMultiple ChoiceIdentify the letter of the choice that best completes the statement or answers the question....
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This note was uploaded on 04/07/2009 for the course CHE 331L taught by Professor Brunet during the Spring '09 term at American International.

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CURRENT AND RESISTANCE ANSWERS - -1-PHYSICS 212CURRENT AND...

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