A 40 W tube light works for 9 hours every day.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A tube light works for hours every day. How many units does it use in a month of days? What does this cost, at rupees a unit?
Need a reminder? The key ideaShow
Energy . One unit is : units power in kW time in hours. Cost units price of one unit.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Units. .
Step 2. Cost. rupees rupees.
Answer: units, costing rupees.
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