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PRACTICE / EMF and internal resistance

The load sees less than the emf

A cell has emf 12 V and internal resistance 1 Ω. It powers a 5 Ω external resistor.

Find its terminal voltage.

Organize the givens & assumptions
  • emf = 12 V
  • r = 1 Ω
  • Rload = 5 Ω

DC source with emf 12 V and constant 1 Ω internal resistance; single external 5 Ω load; steady discharge.

  1. A12 V12\ \mathrm V
  2. B2 V2\ \mathrm V
  3. C14 V14\ \mathrm V
  4. D10 V10\ \mathrm V

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