PHYS 402 Bossier Parish Community College Circuits Worksheet Help me the question, thanks. . . Circuits Worksheet PHYS 402 Sec 01 Summer 2020 Wednesday, Ju
PHYS 402 Bossier Parish Community College Circuits Worksheet Help me the question, thanks. . . Circuits Worksheet
PHYS 402 Sec 01
Summer 2020
Wednesday, July 15, 2020
Problem 1.
(a.) What is the resistance of ten 275 ? resistors connected in series?
(b.) In parallel?
(c.) What is the capacitance of ten 200 µF capacitors connected in series?
(d.) In parallel?
Problem 2.
Carbon-zinc dry cells (sometimes referred to as non-alkaline cells) have an emf of 1.54 V , and
they are produced as single cells or in various combinations to form other voltages.
(a.) How many 1.54-V cells are needed to make the common 9-V battery used in many small electronic devices?
(b.) What is the actual emf of the approximately 9-V battery?
(c.) Discuss how internal resistance in the series connection of cells will affect the terminal voltage of this
approximately 9-V battery.
Problem 3.
(a.) What is the internal resistance of a 1.54-V dry cell that supplies 1.00 W of power to a 15.0-? bulb?
(b.) What is unreasonable about this result?
(c.) Which assumptions are unreasonable or inconsistent?
Problem 4.
(a.) Apply the loop rule to loop abcdef gha in the following figure:
(b.) Apply the loop rule to loop akledcba in the following figure:
Problem 5. Find the resistance that must be placed in series with a 25.0-? galvanometer, having a 50.0-µA
sensitivity, to allow it to be used as a voltmeter with a 0.100-V full-scale reading.
Problem 6.
Suppose you measure the terminal voltage of a 1.585-V alkaline cell having an internal resistance of 0.100 ? by
placing a 1.00-k? voltmeter across its terminals.
(a.) What current flows?
(b.) Find the terminal voltage.
(c.) To see how close the measured terminal voltage is to the emf, calculate their ratio.
Problem 7. The timing device in an automobiles intermittent wiper system is based on an RC time constant
and utilizes a 0.500-µF capacitor and a variable resistor. Over what range must R be made to vary to achieve
time constants from 2.00 s to 15.0 s?
Problem 8. A heart defibrillator being used on a patient has an RC time constant of 10.0 ms due to the
resistance of the patient and the capacitance of the defibrillator.
(a.) If the defibrillator has an 8.00-µF capacitance, what is the resistance of the path through the patient?
(You may neglect the capacitance of the patient and the resistance of the defibrillator.)
(b.) If the initial voltage is 12.0 kV , how long does it take to decline to 6.00 × 102 V ?
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