An ammeter and a copper volta meter are connected in series in an electric circuit through which a c

Question

An ammeter and a copper volta meter are connected in series in an electric circuit through which a constant direct current flows. The ammeter shows 0.5 A. If 0.635 g of Cu is deposited in 0.965 h, what is the percentage error of ammeter? (Cu = 63.5)

Accepted Answer

$\frac{w}{F} = \frac{Q}{F} \Rightarrow \frac{0.635}{63.5} \times 2 = \frac{i \times 0.965 \times 3600}{96500} \Rightarrow i = \frac{2}{3.6}\text{ A}$

$\therefore\%\text{ error = }\frac{\frac{2}{3.6} - 0.5}{\frac{2}{3.6}} = 10\%$

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