Heating an icehockey rink
Excel Energy found has written, that there is around 2'000 kWh used to heat an icehockey rink (Kunsteisbahn) day by day. This might be an abstract amount of energy for a normal citizen. What do you think, how many typical cell phones could be charged with the energy which is used to heat an icehockey rink?
Calculation data
As I have already noted, an ice rink needs around 2'000 kWh per day. A typical cell phone needs 0.01 kWh to charge.
Your Solution
Approximately ___ cell phones could be charged with the energy which is used to heat an ice rink.
Sources:
https://www.xcelenergy.com/staticfiles/xe/PDF/Marketing/MN-Bus-Custom-Efficiency-Ice-Rink-Savings-Suggestions.pdf
https://www.quora.com/How-much-in-kwh-does-it-take-to-charge-a-typical-cell-phone
by Rico Wirth