A battery of e.m.f. 12 V has a terminal p.d. of 10.8 V when delivering 3 A. Its internal resistance is:

  1. 3.6 Ω
  2. 0.4 Ω
  3. 0.8 Ω
  4. 0.2 Ω
Answer

B) 0.4 Ω

mathcalE = V + Ir Rightarrow r = 12 - 10.83 = 0.4 Ω. SLO P-09-E-17 · Understanding

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