8 Mega Watts in your bare hands

I recently went on a nice road trip to Gippstech, an interstate Ham radio conference, with Andrew, VK5XFG. On the way, we were chatting about Electric Cars, and how much of infernal combustion technology is really just a nasty hack. Andrew made the point that if petrol cars had been developed now, we would have all sorts of Hazmat rules around using them.

Take refueling. Gasoline contains 42MJ of energy in every litre. On one of our stops we took 3 minutes to refuel 36 litres. That’s 42*36/180 or 8.4MJ/s. Now one watt is 1J/s, so that’s a “power” (the rate energy is moving) of 8.4MW. Would anyone be allowed to hold an electrical cable carrying 8.4MW? That’s like 8000V at 1000A. Based on an average household electricity consumption of 2kW, that’s like hanging onto the HT line supplying 4200 homes.

But it’s OK, as long as your don’t smoke or hold a mobile phone!

The irony is that while I was sitting on 60 litres of high explosive, spraying fumes along the Princes Highway and bitching about petrol cars I was enjoying the use of one. Oh well, bring on the Tesla charge stations and low cost EVs. Infrastructure, the forces of mass production and renewable power will defeat the evils of fossil fuels.

Reading Further

Energy Equivalents of a Krispy Kreme Factory.

Fuel Consumption of a Pedestrian Crossing