A house has 6 LED bulbs of 15 W each. They burn for 7 h 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 house has LED bulbs of each. They burn for every day.
- How much energy do they use in days, in kWh?
- What is the cost, if one unit costs ₹?
Need a reminder? The key ideaShow
, and one unit on a bill is one kWh. Units power in kW time in hours; cost units the 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. Power. .
Step 2. (a) .
Step 3. (b) ₹ ₹.
Answer: units, costing about ₹.
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