Power dissipation mnemonic

"Twinkle, Twinkle, Little Star..." by Anonymous
Physics 7B
Spring quarter 2002
University of California, Davis, CA

Students are told that if they will remember only one thing from physics, it will be this mnemonic:

Twinkle, twinkle, little star,
Power equals I squared R.

The usual reaction is a collective snort from the class. But years later, this prediction seems to be the case for many students...