Why is combustion cheaper than electricity to run when it comes to heating but not when it comes to transportation?
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I might be misunderstanding your question but from a manufacturing point of view an electric car is very simple. It doesn’t need a complex engine, transmission with variable gearing, etc. The expensive portion is just the battery. An internal combustion car however has a lot of complexity to work efficiently but we make a lot of them and have been doing that for a long time so we have gotten very good at it.
At home however it is a different story. We don’t need to run an engine for heating that is done at the power station. We also don’t need to run a complex internal combustion engine to make mechanical power we are just making heat. It is very simple to do either electrically or by burning natural gas so all that really matters is how expensive the electricity or the gas is. The gas is very cheap compared in many countries.
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