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6) If two lights of capacity 80W replaced by 20W, which run for 6 hours per day. What will be energy savings per month (30 days) in KW/hr?

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For the 80W bulbs you'll be using 2 x 80 x 6 x 30 = 28800 W/hr = 28.8kW/hr.

For the 20W bulbs, it's 2 x 40 x 6 x 30 = 7200 W/hr =7.2 kW/hr.

The monthly saving is 21.6 kW/hrs, a saving of 75%.

Posted on Sep 04, 2010

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