5. -/3 points OSCoIPhys2016 21.4. P 050 My Notes Ask Your Teacher + Suppose you

Question

5. -/3 points OSCoIPhys2016 21.4. P 050 My Notes Ask Your Teacher + Suppose you measure the terminal voltage of a 1.565 V alkaline cell having an internal resistance of 0.400 by placing a 3.00 voltmeter across its terminals. (See figure below.) emf (a) What current (in A) flows? (b) Find the terminal voltage (in V). (Give your answer to at least 4 decimal places.) (c) To see how close the measured terminal voltage is to the emf, calculate their ratio. (Give your answer to at least 4 decimal places.) srnf Additional Materials Reading

Explanation / Answer

A) current flows is i = V/R = 1.565/(r+R) = 1.565/(0.4+3000) = 5.22*10^-4 A

b) V = e-(i*r) = 1.565-(5.22*10^-4*0.4) = 1.5647 V

c) V/emf = 1.565/1.564 = 1.000639

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