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# DIRECT CURRENT CIRCUITS ANSWERS - PHYSICS 212...

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-1- PHYSICS 212 DIRECT-CURRENT CIRCUITS WORKBOOK ANSWERS

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-2- PHYSICS 212 OUTLINE DIRECT-CURRENT CIRCUITS 1 SOURCES OF EMF What does the abbreviation emf represent? electromotive force Explain the difference between a battery’s emf and its terminal voltage. The battery emf is the voltage produced internally. The terminal voltage is the accessible external voltage. 2 RESISTORS IN SERIES Draw 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 the battery voltage. How is the equivalent resistor calculated? The equivalent resistor is the sum of the individual resistors in series. 3 RESISTORS IN PARALLEL Draw 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 the group . 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 all the resistors in parallel. 4 RC CIRCUITS Suppose a capacitor and resistor are connected in series. During the charging process I, Q, and V C change. Write equations for these quantities. 0 0 0 1 1 t RC t RC t RC I I e Q Q e V V e = =  − =  − 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 initial value . When a capacitor discharges through a resistor I, Q, and V C change. Write equations for these quantities. 0 0 0 t RC t RC t RC I I e Q Q e V V e = = =

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-4- 5 HOUSEHOLD CIRCUITS How is 240 V produced in circuits for large appliances? The appliance is connected between two wires, one is 120 V above ground and the other is 120 V below ground. 6 ELECTRICAL SAFETY List what may likely occur for each of the following currents if passing through a person. 5 mA - sensation of shock, usually no damage or harm 10 mA - muscle contraction and possible inability to let go of wire 100 mA - potentially fatal What does the abbreviation GFI represent and how does the device work? Ground-Fault Interrupt
-5- PHYSICS 212 MULTIPLE CHOICE QUESTIONS DIRECT-CURRENT CIRCUITS Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. C___

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DIRECT CURRENT CIRCUITS ANSWERS - PHYSICS 212...

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