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Electric Circuits, Resistance and Ohm's Law — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsElectric Circuits, Resistance and Ohm's Law1 Mark
MCQ
If 'r' is the internal resistance of a cell, such that 'E' is its e.m.f., V is potential difference and R is the external resistance of circuit then the expression for internal resistance is:
  • ✓
    $r=\frac{ R ( E - V )}{ V }$
  • B
    $r=\frac{ E - V }{ RV }$
  • C
    $r=\frac{ V }{ R ( E - V )}$
  • D
    None of these
✓

Answer

Correct option: A.
$r=\frac{ R ( E - V )}{ V }$
A

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