Apower station burns 75 kilograms of coal per second. each kg of coal contains 27 million joules of energy.
a. what is the total power of this power station in watts? (watts=joules/second)
b. the power station’s output is 800 million watts. how efficient is this power station?
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Ответ:
jj
Explanation:
Energy obtained by burning of 1 kg coal = 27 million Joule
a.
Energy obtained by burning of 75 kg coal = 27 x 75 = 2025 million Joule
Power = Energy obtained per second
Power =![\frac{2025}{1} million Joule per second](/tpl/images/0178/3983/15846.png)
P =![\frac{2025}{1}\times 10^{6} Watt](/tpl/images/0178/3983/a9fff.png)
P =![\frac{2.025}{1}\times 10^{9} Watt](/tpl/images/0178/3983/2fb7b.png)
b.
Input power = 2025 million Watt
Output power = 800 million Watt
Efficiency = output power / input power
Efficiency = 800 / 2025 = 0.395
Efficiency = 39.5%
Ответ: