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A battery with EMF 90.0V has internal resistance R_B= 8.46. A)What is the reading V_v of...

A battery with EMF 90.0V has internal resistance R_B= 8.46.

A)What is the reading V_v of a voltmeter having total resistance R_v= 490 when it is placed across the terminals of the battery?

B)What is the maximum value that the ratio R_B/R_v may have if the percent error in the reading of the EMF of a battery is not to exceed 3.50% ?

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Answer #1

A) Total resistance= 498.46Ω

I= 90/498.46 =0.180 A

Voltmeter reading= 90-.180*8.46= 88.47 V

B) Let, E be the EMF.

so, 0.035E= I*RB

0.965E=I*Rv

RB/Rv= 0.036

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