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A battery of emt E has an internal resistance 'r'. If current I is drawn then terminal potential V1 is given by:

Correct answer: B. V1 =E-Ir

  • A. V1=E+Ir
  • B. V1 =E-Ir
  • C. V1 =E/1-r
  • D. V1 = Er
  • E. V1 =E/I+r

Explanation

The terminal potential (V1) of a battery with an internal resistance (r) when a current (I) is drawn can be calculated using the formula: V1 = E - Ir As it is a numerical only one option B is correct.

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About Current Electricity

Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.

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