An inaccurate ammeter and silver coulometer connnected in series in an electric circuit through which a constant direct current flows. If ammeter reads `0.6` ampere throughout one hour, the silver deposited on coulometer was found to be `2.16 g`. What `%` error is in the reading of ammeter? Assume `100%` current efficiency.

Explanation

`(w)/(E) = (i.t)/(96500)`
`(2.16)/(108) = (i xx 60 xx 60)/(96500)`
`:. i = 0.54` ampere
error in current `= 0.60-0.54 = 0.06`
`:. %` error `= (0.06)/(0.6) xx 100 = 1%`