This is how much it costs to charge your phone for a year

Do you ever feel guilty for charging your phone at a mate's house?

Well, you really shouldn't. According to Forbes, it's actually not very expensive to charge your smartphone for the year. An iPhone/average smartphone holds around 1,440mAh of charge, or about 5.45 watt hours. This means that if you were to drain and charge your phone everyday, it would require 2,000 watt hours (or 2 kWh) of energy a year. This equates to less than 18p to charge your phone over a whole year according to Forbes. You read that right - 18 pence. Your laptop may cost slightly more by using 72 kWh, which means it would incur a charge of around £5.60 to charge your laptop for 12 months. Of course this is all assuming that you only need to charge your phone once a day and don't leave it charging after the battery is full. Which none of us ever do...