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
Global Bitcoin Electricity Consumption
The Cambridge University estimated (since the exact calculation is difficult) the global electricity consumption of Bitcoin mining around 121.36 Terawatt-hours (TWh).
What do you think? How long could the city of Zurich could be supplied with this amount of energy when we take the consumption data of Zurich for 2018 for example?
The city of Zurich could be supplied with energy for approximately _______ [years]. This is ridiculous!
[1] 
[2]
Data - City of Zurich
Energy consumption (Watt/Person | Stand: 2018):
[3]
Sources:
[1] BBC News (https://www.bbc.com/news/technology-56012952)
[2] stadt-zuerich.ch (https://www.stadt-zuerich.ch/gud/de/index/umwelt_energie/energie-in-zahlen/2000-watt-indikatoren/primaerenergiebilanz.html)
[3] stadt-zuerich.ch (https://www.stadt-zuerich.ch/prd/de/index/statistik/themen/bevoelkerung/bevoelkerungsentwicklung/aktueller-bevoelkerungsbestand.html)
by Claudio & Kadir
An electric vehicle/car travels at an average speed of 54 km/h, consuming 240 Watt per 100 km on average.
The total distance is 237 km. How much energy is consumed during the whole distance in kWh?
In addition, the driver eats a pack of gummy bears containing 250g. The gummy bears have a nutritional value of 340 kcal per 100g.
How much kcal are consumed by the driver and the vehicle during this distance?
Written by Alexa and David
The distance by car from Zurich to Bern is approximately 123 km. An electric car consumes an average of 15 kWh/100 km.
How much kWh do you use to travel from Zurich to Bern?
Sandra & Joelle