Discussion
A thresher handles \( 1.2 \) tonnes of grain per hour and draws \( 9.0 \) kW. Its specific energy consumption is
Answer: D
Correct answer: 7.5 kWh per tonne
Divide the power drawn by the throughput:
\[ \frac{9.0\ \mathrm{kW}}{1.2\ \mathrm{t/h}} = 7.5\ \mathrm{kWh\ per\ tonne} \]
The units work out directly, since kilowatts divided by tonnes per hour give kilowatt-hours per tonne. Expressed this way the figure can be compared between machines of quite different size, and it can be set against the value of the grain to judge whether the fuel or electricity cost is significant.
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