One thing we have learnt this week

I’m not sure about “we have learnt” should be the title this week of this regular post.  Perhaps “I have learnt” would be a more appropriate title.

I have been reminded of how much energy it takes to boil a small amount of water.  A friends husband at our homegroup barbecue got us to demonstrate this by means of heating it by pedal power.  He and some friends had built a home-made pedal powered heater.  Bits of bike attached to dynamo with a heating element in an insulated box.  It took 5 of us with about 2 minutes pedalling each to get the cup of water boiling.  And yet we flick the switch on a kettle without thinking about it.  A picture can be seen on our Facebook page (link on the RHS).




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