Question

In: Mechanical Engineering

Two electric bulbs of 100 ohms are used for 8 hours daily. What is the cost...

Two electric bulbs of 100 ohms are used for 8 hours daily. What is the cost of them for 1 day if the rate is 75 paise per unit?

Solutions

Expert Solution

Steps:-

In this question supply voltage is not given so we assume supply voltage is 220 volt and after by Ohm's law we calculate amount of current and after we calculate after it we obtained consumed kwh in one day . and finaly we calculate cost of electricity.concept:- this is is an aptitude question only basic requirement is Ohm's law and definition of one unit which is equal to 1 kwh.


Related Solutions

Two light bulbs, one with a resistance of 30 ohms and the other 40 ohms, are...
Two light bulbs, one with a resistance of 30 ohms and the other 40 ohms, are arranged in two different circuits with a 120 volt source. A] The two bulbs are first connected in parallel to the source. i. Draw a schematic of the circuit –clearly labeled. ii. Determine the current, voltage and power through each bulb. B] The two bulbs are now connected in series to the source. i. Draw a schematic of the circuit –clearly labeled. ii. Determine...
The electric usage of LED is 8 watts and incandescent bulbs take up 40 watts. The...
The electric usage of LED is 8 watts and incandescent bulbs take up 40 watts. The lifetime of LED bulbs is 25 000 hours and the lifetime for incandescent bulb is 2500 hours. How much energy could be saved each year by replacing incandescent bulbs with LED bulbs? Assume that six 40-watt lamps arer lit an average of three hours a night and they are each replaces with 8 watt LED-bulbs.
Two identical electric bulbs are connected in series and then to a battery. The third identical...
Two identical electric bulbs are connected in series and then to a battery. The third identical bulb then is connected in parallel to the line of first two bulbs. This additional connection will: Increase the illumination produced by bulbs connected in series Decrease the illumination produced by bulbs in series Leave the illumination produced by bulbs in series unchanged It will change illumination somehow, but we need to know the voltage on battery and resistances of bulbs to answer.
TKK Products manufactures 50-, 60-, 75-, and 100-watt electric light bulbs. Laboratory tests show that the...
TKK Products manufactures 50-, 60-, 75-, and 100-watt electric light bulbs. Laboratory tests show that the lives of these light bulbs are normally distributed with a mean of 650 hr and standard deviation of 100 hr. What is the probability that a TKK light bulb selected at random will burn for the following times? (Round your answers to four decimal places.) (a) more than 850 hr (b) less than 500 hr (c) between 650 and 850 hr (d) between 500...
Assume that daily TV viewing is normally distributed and has a mean of 8 hours per...
Assume that daily TV viewing is normally distributed and has a mean of 8 hours per household with a standard deviation of 2 hours. Find the following probabilities: Probability that a randomly selected household views TV more than 10 hours a day, i.e. P( x > 10) Probability that a randomly selected household views TV more more than 11 hours a day, i.e. P(x > 11) Probability that a randomly selected household views TV less than 3 hours a day,...
Assume that daily TV viewing is normally distributed and has a mean of 8 hours per...
Assume that daily TV viewing is normally distributed and has a mean of 8 hours per household with a standard deviation of 2 hours. Find the following probabilities: Probability that a randomly selected household views TV more than 10 hours a day, i.e. P( x > 10) Probability that a randomly selected household views TV more more than 11 hours a day, i.e. P(x > 11) Probability that a randomly selected household views TV less than 3 hours a day,...
Two light bulbs are 1.00 mapart. From what distance can these light bulbs be marginally resolved...
Two light bulbs are 1.00 mapart. From what distance can these light bulbs be marginally resolved by a small telescope with a 3.90 cm-diameter objective lens? Assume that the lens is diffraction limited and λ=600nm.
What is the effective annual rate of 8% compounded daily?
What is the effective annual rate of 8% compounded daily?
Bradford Electric Illuminating Company is studying the relationship between kilowatt-hours (thousands) used and the number of...
Bradford Electric Illuminating Company is studying the relationship between kilowatt-hours (thousands) used and the number of rooms in a private single-family residence. A random sample of 10 homes yielded the following. Number of Rooms Kilowatt-Hours (thousands) Number of Rooms Kilowatt-Hours (thousands) 12 9 8 6 9 7 10 8 14 10 10 10 6 5 5 4 10 8 7 7 Determine the 0.95 confidence interval, in thousands of kilowatt-hours, for the mean of all six-room homes. (Do not round...
Daily Enterprises is purchasing an $8 million machine. It will cost $100,000 to transport and install...
Daily Enterprises is purchasing an $8 million machine. It will cost $100,000 to transport and install the machine. The machine has a depreciable life of five years using the straight-line depreciation and will have a market value of $1 million after the 5th year. The machine will generate incremental revenues of $5.0 million per year along with incremental costs of $2.4 million per year. Daily’s marginal tax rate is 30%, and the firm will run the project for 5 years....
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT