A 10 V battery with internal resistance 1 Ω and a 15 V battery with internal resistance 0.6 Ω are connected in parallel to a voltmeter (see figure). The reading in the voltmeter will be close to:

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The equivalent emf of the battery parallel combination is given as Equation = E 1 r 1 + E 2 r 2 1 r 1 + 1 r 2 = 10 1 + 15 0.6 1 1 + 1 0.6 = 10 + 150 6 1 + 10 6 = 105 8 = 13.1 V ∴ The reading measured by voltmeter = 13.1 V

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