PhysicsRankPREVIEWTry a problem

THE PRACTICE STUDIO

Go slowly. Ask why. Make it yours.

PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Electrical power

Doubling voltage changes heating

A fixed ohmic resistor dissipates 8 W under a certain DC voltage. Its voltage is doubled and its temperature is held constant.

Find its new power dissipation.

Organize the givens & assumptions
  • Pinitial = 8 W
  • Vfinal = 2Vinitial
  • R fixed

Fixed ohmic resistance and constant temperature; DC voltage across the resistor.

  1. A16 W16\ \mathrm W
  2. B8 W8\ \mathrm W
  3. C4 W4\ \mathrm W
  4. D32 W32\ \mathrm W

Try it on paper first. Free sample problems in every collection include the complete reasoning: find one in this collection →