An ammeter and copper voltmeter are connected in aseries in an electric circuit through which a constant direct current flows. The ammeter shows `0.525` ampere. If `0.6354 g` of `Cu` is deposited in `1` hr, what is the percentge error of ammeter ? `["At. wt. of "Cu = 63.54]`

Answer

2

Explanation

Current flown `= 0.525` ampere as shown by ammeter
Actual current flown, `i = (w xx 96500)/(E xx t)`
`=(0.6354 xx 96500)/((63.5)/(2) xx 60 xx 60) = 0.536` ampere
Thus, error in current
`= 0.536 - 0.525 = 0.011`
`:. %` error in ameter `=0.011/0.536xx100`
`= 2.05% approx 2.0 %`