How Much Does it Cost to Write This Blog?

So how do I figure it out? For starters, here's what I need:
1. A laptop - 65W
2. A router and modem - About 10W combined
3. Internet connection - $19/month

How much does it cost to keep the power on? Well, it really isn't that difficult, but it will take some explaination...

The rate of electrical use at any moment is measured in watts (from here). A light bulb puts out 100W, a computer maybe 200W, and a phone charger about 3.75W to name a few.

Electricity is billed by the kilo watt-hour (kWh). What is a kilo watt-hour? One watt-hour is the energy used by a 1 watt device running for 1 hour. 1 kWh equals 1,000 Watt-Hours. So for the examples above:
- A 100W light bulb on for 10 hours: 100 x 10 = 1000 Watt-Hours or 1kWh
- a 200W computer on for 10 hours: 200 x 10 = 2000 Watt-Hours or 2kWh
- a 3.75 phone charger on for 10 hours: 3.75 x 10 = 37.5 or .0375kWh

The cost of electricity varies widely by location and even time of year and time of day. I'll assume a cost of $0.12 per kWh.

So for the same items, we have:
- A 100W light bulb on for 10 hours: 1kWh x $0.12 = $0.12
- a 200W computer on for 10 hours: 2kWh x $0.12 = $0.24
- a 3.75W phone charger on for 10 hours: .0375kWh x $0.12 = $0.0045

I'll assume it takes me 1 hour to write this excuse for a blog. I need to pay for the Internet connection equipment anyway, so writing this blog doesn't change my internet costs - I'll ignore them. All I need is my computer:

65W * 1h = 65Wh
65Wh = .065 kWh
0.65kWh * $0.12/kWh =

Drum roll, please...
This blog is worth a grand total of $0.0078!!!

It also confirms something else very important:
$0.0078 * 12 = $0.10
My blogs are a dime a dozen!