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Problem 18 %. The overall efficiency of an electric system, coal pile to lights a lamp is What fraction of a kg of coal containing 10250 KJ/kg must be consumed to light a 1350 W lamp for 45 minutes? Ans. 1.976 KJ

Problem 18 %. The overall efficiency of an electric system, coal pile to lights a lamp is What fraction of a kg of coal containing 10250 KJ/kg must be consumed to light a 1350 W lamp for 45 minutes? Ans. 1.976 KJ

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Problem 18 %. The overall efficiency of an electric system, coal pile to lights a lamp is What fraction of a kg of coal containing 10250 KJ/kg must be consumed to light a 1350 W lamp for 45 minutes? Ans. 1.976 KJ
Transcribed Image Text:Problem 18 %. The overall efficiency of an electric system, coal pile to lights a lamp is What fraction of a kg of coal containing 10250 KJ/kg must be consumed to light a 1350 W lamp for 45 minutes? Ans. 1.976 KJ
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