What input current and voltage are needed
A step-up transformer has 4 turns on the primary coil and 500 turns on the secondary coil. If this transformer is to produce an output of 4500 V with a 12 mA current, what input current and voltage are needed?
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Compute the 95% confidence interval for the population mean. Round your answers to three decimal places. Write your answer using parentheses and a comma, in the form (n1,n2).
A neon sign that requires a voltage of 12000 V is plugged into a 120 V wall outlet. What ratio of turns (primary/secondary) must the transformer have to power the sign?
The annual cost of operating a heat pump at year-end prices is R, with units of $/yr. Show that the uniform annual costs are?
You are interested to know if your shop in the suburbs has customers of the same age as your shop in the center of the city. Statistics of customer ages are: Suburbs: X= 38, s = 3.5, n = 19 City Center: 5Z- = 42, s = 4.0 , n = 24. Calculate the po
Pump A can empty a tank in four hours, while pump B takes only three hours to empty the tank. how long will it take to empty the tank if both pumps are used simultaneously?
Boat A and boat B leave from point O (the origin) at the same time. Boat A is traveling at 20 ft/s 30 degrees west of north. Boat B is traveling at 15 ft/s 45 degrees east of north. How long after leaving shore will the boats be 800 ft apart?
A hydro-electric plant uses an 85% efficient turbine-generator to produce power from a reservoir with a height of 45 m above the turbine.
What is the ratio of the minimum viewing distance to the vertical dimension of the TV screen such that you will not be able to resolve the lines? assume the average wavelength of light coming from the screen is 550nm, the pupils of your eyes are 5
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