Light bulbs are typically rated by their power dissipation whenoperated at a given voltage.

Which of the following light bulbs has the largest current throughit when operated at the voltage for which it's rated?
(a) 3.2 W, 6.0 V
(b) 24 W, 12 V
(c) 16 W, 18 V
(d) 32 W, 24 V

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Casey DurganLv2

9 Apr 2019

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A household's electric bill is shown below. Use this electric billto answer the following questions except for D. For D you'll needto actually go around your home and count up the total wattage ofall the light bulbs you are using.

NOTE: Your answers for A, B, & C must be exact to be counted ascorrect.WebAssign will check your answer for the correct number ofsignificant figures.

Service From: NOV 20 to DEC 18 (28 days)
PREVIOUS BILL AMOUNT PAYMENTS
(-) NEW CHARGES (+) ADJUSTMENTS (+ OR -) AMOUNT DUE (=)
$262.61 $262.61 $114.09 $5.71 $119.80

PREVIOUS METER READING PRESENT METER READING TOTAL USAGERESIDENTIAL SERVICE SALES TAX (3%) NEW CHARGES
51517 kWh 52394 kWh 877 kWh $110.77 $3.32 $114.09

A.) State the number of days in the billing cycle for the electricbill shown above.

Answer:________ days

B.) State the number of kWh used in this cycle.

Answer:________ kWh

C.) State how much the household was charged for energy used inthis cycle. Do not include taxes nor other fees.

Answer: $__________

D.) State the total wattage of all the light bulbs in yourhome.

Answer:________ W

E.) What is the cost per kWh? Do not include taxes nor otherfees.

Answer:_________ $/kWh

Answer:_________ Â¢/kWh

F.) In joules, how much energy did this household use?

Answer:__________ J

G.) What was this household's average power consumption? Expressyour answer in both W and kW.

Answer:___________W

Answer:___________ kW

H.) The electric company has seen to it that each home is providedwith roughly 120 V at each electrical outlet (there are a few thatare 240 V but we'll ignore those). Using this fact and yourprevious answer (the power in W) determine the average current thatwas running through this house.

Answer:___________ A

A popular car stereo has four speakers, each rated at 60 W. In answering the following questions, assume that the speakers produce sound at their maximum power.

A) Find the intensity I of the sound waves produced by one 60-W speaker at a distance of 1.0 m.

B) Find the intensity I of the sound waves produced by one 60-W speaker at a distance of 1.5 m.

C) Find the intensity I of the sound waves produced by four 60-W speakers as heard by the driver. Assume that the driver is located 1.0 m from each of the two front speakers and 1.5 m from each of the two rear speakers.

D)The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately 10^(-12) W/m2. Find the distance, d from the car at which the sound from the stereo can still be discerned. Assume that the windows are rolled down and that each speaker actually produces 0.06 W of sound, as suggested in the last follow-up comment.

orchidhornet724

For the following circuit, you ultimately want to measure the power dissipation of the 6.0 Ohm resistor:

a) First, redraw the diagram on the page you are turning in.

b) Define the directions of the currents arriving at the top junction by stating the direction of the current is at points a, b, and c (i.e. up, down, left, or right). Physically draw the directions of these currents on the diagram.

c) Write an equation in the space below for the Kirchhoff Junction Rule for the current directions arriving at the top junction as chosen in part a).

d) Choose two Kirchhoff loops that include the 6.0 Ohm resistor. Physically draw these two loops on the diagram.

e) Write out a simple equation for each circuit element in your two Kirchhoff loops Clearly denote for each term whether it is a rise (+) in voltage or a drop (-) in voltage for your Kirchhoff loops.

f) Combine your equations from part c) and part e) to solve for the current through the 6.0 Ohm resistor. g) Use your result from part f) to solve for the power dissipation of the 6.0 Ohm resistor