Answer:
(a) 1 J is the amount of work done on an object when a
force of IN displaces it by 1m along the line of action of the force.
1 J = 1 Ws
(b) Energy consumed by 3 bulbs in one day
Energy consumed by bulbs in 30 days
= 0.9 x 30 =27 kWh
Cost of 1 kWh= `
3
Cost of 27 kWh = 3 x 27 = `
81
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