Question

In: Electrical Engineering

Ch 26 32. A power pack charging a cell phone battery has an output of 0.4...

Ch 26

32. A power pack charging a cell phone battery has an output of 0.4 A at 5.2 V, both rms. If the power pack is plugged into a 120 V wall socket, what is the rms current? 17.3 mA

33. A neon sign transformer has a 450 Watt AC output with an rms voltage of 15kV when connected to a normal household outlet. There are 500 turns of wire in the primary cell.

a) How many turns of wire are in the secondary coil? 62,500 turns

b) When the transformer is running full power. What is the current in the secondary coil? 30 mA

c) When the transformer is running full power. What is the current in the primary coil? 3.75 A

34. A generator produces 250 kW of electric power at 7.2 kV. The current is transmitted to a remote location through wires with a total resistance of 15 W.

a) What is the power loss due to the resistance in the wires? 18 kW

b) What is the power loss if the voltage increased to 30 kV? 1 kW

35. A 20 µF capacitor is connected across an AC generator that produces a peak voltage 6 Volts. The peak current is 0.2 A. What is the oscillation frequency in Hz? 265 Hz

36. A 500 µH inductor is connected across an AC generator that produces a 3.5 V rms Voltage. What is the frequency if the peak current is 50 mA? 31.5 kHz

37. An FM radio station broadcasts at a frequency of 103.5 MHz. What inductance should be paired with a 10 pF capacitor to build a receiver circuit for this station? 236 nH

Solutions

Expert Solution


Related Solutions

A company claims their new cell phone model has a mean battery life of 60 hours....
A company claims their new cell phone model has a mean battery life of 60 hours. A consumer group suspects this claim is exaggerated so they record the battery life of 100 randomly selected cell phones of this model and conduct a hypothesis test. The sample gives a mean life of 58 hours and a standard deviation of 10. Use this information to answer the following questions. a. What is the null hypothesis about the population mean battery life? b....
the population of cell phone battery life span is normally distributed with a mean of 450...
the population of cell phone battery life span is normally distributed with a mean of 450 charge cycles with a population standard deviation of 35 charge cycles a) A single cell phone battery is selected at random. What is the probability that it will have a lifespan of 400 charge cycles or less? b) A SRS of 50 cell phone batteries is selected, determine the probabiltiy that it will have an average life span of at least 460 charge cycles?...
A neighborhood fuel cell power plant is to be designed for an electric power output of...
A neighborhood fuel cell power plant is to be designed for an electric power output of 2000 kW with liquid– water product. Estimate the flow rates of hydrogen and oxygen during peak power production, assuming an 80% efficient power conditioner is used to convert DC to AC power and the fuel cell efficiency is 55%. What is the plant heat rate?
Many resistors are connected purely in parallel to a 17 battery and the power output of...
Many resistors are connected purely in parallel to a 17 battery and the power output of the battery is 169 Watts. One resistor is removed (but the rest remain connected in parallel to the same battery) and the current coming out of the battery is 3.3 amps with that resistor removed. What was the value of the resistance of the removed resistor in Ohms?
Suppose that for a specic model of cell phone, the life-length of a fully-charged cellphone battery...
Suppose that for a specic model of cell phone, the life-length of a fully-charged cellphone battery is normally distributed with a mean of 1200 minutes and a standard deviation of 160 minutes. (a) A person charges his/her cellphone at night and uses it during the day for about 16 hours. What is the probability that he/she does not have to charge his/her cell phone during the day? (b) 80% of fully-charged cell-phone batteries have a life-length more than how many...
In a paragraph, explain why do consumers perfer a long lasting cell phone battery.
In a paragraph, explain why do consumers perfer a long lasting cell phone battery.
A cell phone manufacturer claims that the population mean battery life of its flagship smartphone model,...
A cell phone manufacturer claims that the population mean battery life of its flagship smartphone model, the Black Bear, is greater than the population mean battery life of the largest competitor, the Grizzly. A consumer advocacy publication tests this claim by purchasing a random sample of Black Bear smartphones and a random sample of Grizzly smartphones. Members of the publication charged each smartphone to full capacity and then had the smartphones play back the same videos until the batteries were...
A company that produces cell phones claims its standard phone battery lasts longer on average than...
A company that produces cell phones claims its standard phone battery lasts longer on average than other batteries in the market. To support this claim, the company publishes an ad reporting the results of a recent experiment showing that under normal usage,their batteries last at least 35 hours. To investigate this claim, a consumer advocacy group asked the company for the raw data. The company sends the group the following results: 35, 34, 32, 31, 34, 34, 32, 33, 35,...
The Phone Company has the following costs of producing and selling a cell phone when it...
The Phone Company has the following costs of producing and selling a cell phone when it produces and sells 100,000 cell phones per month: Per unit manufacturing cost             Direct materials                                              $60.00             Direct labor                                                     10.00             Variable manufacturing overhead cost             35.00             Fixed manufacturing overhead cost                 20.00 Per unit selling cost             Variable                                                          20.00             Fixed                                                               10.00 Note that ‘100,000’ is the denominator used to calculate fixed costs per unit. Total fixed costs...
Jujube Tech is a startup that successfully sold a popular portable phone battery and has accumulated...
Jujube Tech is a startup that successfully sold a popular portable phone battery and has accumulated a large of amount of cash, which is sufficient for the firm's investment for the next 5 years, according to estimates. Are Jujube Tech's investment decisions affected by the interest rate this year?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT