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

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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