A battery of e.m.f. 6 V has a terminal p.d. of 5 V when delivering 2 A. Its internal resistance is:

  1. 2.5 Ω
  2. 0.25 Ω
  3. 1 Ω
  4. 0.5 Ω
Answer

D) 0.5 Ω

mathcalE = V + Ir Rightarrow r = 6 - 52 = 0.5 Ω. SLO P-09-E-17 · Understanding

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