Answer
Never.
Work Step by Step
Energy is conserved, and nothing can create it or destroy it. Energy can be transformed into different forms, but it can't be "stepped up".
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 25 - Think and Explain - Page 482-483: 79
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