A 12 V source with internal resistance 2 Ω supplies a 4 Ω resistor. The efficiency of the power transfer is:

  1. 33.3%
  2. 66.7%
  3. 50%
  4. 100%
Answer

B) 66.7%

Efficiency = I^2RI^2(R + r) = RR + r = 66.7%. SLO P-09-E-26 · Understanding

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