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Unformatted text preview: V ad in the • circuit to the right? (b) What is the terminal voltage of the 4.00-V battery? (c) A battery with emf 10.30 V and internal resistance 0.50 Ω is inserted in the circuit at d, with its negative terminal connected to the negative terminal connected to the negative terminal of the 8.00-V battery. What is the difference of potential V bc between the terminals of the 4.00-V battery? • 25.86 A source with emf ξ and internal resistance r is connected to an external circuit. • (a) Show that the power output of the source is maximum when the current in the circuit is one-half the short circuit current of the source. (b) If the external circuit consists of a resistance R , show that the power output is maximum when R = r , and that the maximum power is ξ 2 /(4 r )....
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