# A 100-watt light bulb burns 6 hours a day. Calculate the cost of energy consumed per month

July 29, 2021 | education

| **A 100-watt light bulb burns 6 hours a day. Calculate the cost of energy consumed per month and the work of the current.**

We adhere to the SI system, we convert the time from hours to seconds. We know that 1 hour – 3600 seconds => 6 hours – 21600 seconds. This means that the light bulb burns for 6 hours in one day. Let’s say one month is 30 days. Let’s find how long the light bulb has been working in a month: 21600 * 30 = 648000 (s). It remains to calculate what kind of work she will do in the time worked. To do this, you need to calculate the product of power and time: 100 * 648000 = 64800000 (J) = 64800 (kJ) = 64.8 (MJ). Choose the answer you would like to write down, they are all equal.

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