Discussion
Which of the following is NOT a primary form of energy?
Answer: B
Correct answer: petrol
Petrol is a secondary energy form: it is refined from crude oil, so it is a carrier rather than a source. Coal, crude oil and solar radiation are all primary, being found in nature and not derived from any other form. Electricity is secondary for the same reason, which matters when energy balances are drawn up - counting both a primary source and the carrier made from it would double count.
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