A circuit below consists of four resistors connected by ideal wires. The circuit draws power P if an ideal battery is connected to either points A and D or points B and C. If the same battery is connected to either points A and B or points C and D, the circuit draws power 2P.

What power would be drawn if the same battery is connected to points A and C?

Our January Challenge, Gas is ideal and U R 2, attracted many solutions from teachers and students alike.

We are pleased to recognize the following contributors:

  • R.R. Bukrey (retired, Loyola University, Evanston, IL)

  • Phil Cahill (The SI Organization, Inc., Rosemont, PA)

  • Dan Cornea (Tian Yi High School, Wuxi, Jiangsu province, China)

  • Don Easton (Lacombe, Alberta, Canada)

  • Supriyo Ghosh (KolKata, India)

  • José Ignacio Íñiguez de la Torre (Universidad de Salamanca, Salamanca, Spain)

  • Daniel Mixson (Naval Academy...

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