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The figure below shows an electric circuit connected to a battery. If the internal resistance of the battery is 0.2Ω.
Figure of electric circuited connected to a battery
Determine the electromotive force e.m.f of the battery.  

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Effective resistance
=(10 × 5) +2Ω +0.2Ω
   (10+5)
=5.533Ω
I in 10Ω=10v/10Ω =1.0AM
Total current
=(2.0 +1.0)A =3.0A
E=3.0A × 5.533Ω
  =16.6V

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