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5 Apr 2021
Problem 4 - (15-Points) Suppose that the incandescent light bulb is used for lighting
whose efficiency is 0.034 . (a) Also suppose that we provide 400000 J of energy in an
hour to produce 45 Wh of energy in a power plant that uses coal. Calculate the efficiency
of the power plant. (b) Suppose that the transmission lines that use to transmit electric
energy to the houses looses 8 % of the electric energy on the way to houses. What is the
efficiency transmission lines? (c) Calculate the total eficiency of the electric system from
power plant upto including incandescent light bulb. (d) Suppose that for such system,
100W of elctrical energy is supplied, how much energy will be used and lost in kWh?
Problem 4 - (15-Points) Suppose that the incandescent light bulb is used for lighting
whose efficiency is 0.034 . (a) Also suppose that we provide 400000 J of energy in an
hour to produce 45 Wh of energy in a power plant that uses coal. Calculate the efficiency
of the power plant. (b) Suppose that the transmission lines that use to transmit electric
energy to the houses looses 8 % of the electric energy on the way to houses. What is the
efficiency transmission lines? (c) Calculate the total eficiency of the electric system from
power plant upto including incandescent light bulb. (d) Suppose that for such system,
100W of elctrical energy is supplied, how much energy will be used and lost in kWh?
