A cell of e.m.f. 1.5 V and internal resistance 0.5 Ω is connected to a 2.5 Ω resistor. The terminal p.d. is:

  1. 0.625 V
  2. 1.25 V
  3. 2.5 V
  4. 12.5 V
Answer

B) 1.25 V

I = mathcalER + r = 0.5 A; V = IR = 1.25 V (lost volts Ir = 0.25 V). SLO P-09-E-17 · Understanding

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