Question

A lawn mower has consumed 2 160 000 J of electrical energy. It converts 864 000 J to
make noise and heat and the rest to spin the blades. Calculate the efficiency of the lawn mower.

Answer 1

Explanation:

Energy consumed by certain households in a month E=250 units =250 kWh

∴E=250×3.6×10

6

J (∵1kWh=3.6×10

6

J)

⟹E=9×10

8

Joules

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