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Two cells of EMF 2E and E and internal resistance 2r and r respectively are connected in parallel. Obtain the expression for the equivalent EMF and the internal resistance of the combination??
Equivalent internal resistance is simplyreq=r1r2/(r1+r2)=2r/3For parallel connection total currentI=I1+I2Or,Eeq/req=E1/r1+E2/r2Or,Eeq=reqE1/r1+reqE2/r2=(r2E1+r1E2)/(r1+r2)=4E/3
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