Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . be evolvedis used to determine thecurrent strength. Aweight voltameter isillustrated in Fig. two outside platesform the anode, and arejoined together and toone binding post, whilethe cathode is placedbetween them and con-nected to the other bind-ing post. The cathodethus receives a depositon both sides. An adjustable arm serves to lower theplates into the electrolyte. A gas voltameter is describedin % 120. 119. Voltameter Calculations.—First : To calculate THE STRENGTH OF AN U
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . be evolvedis used to determine thecurrent strength. Aweight voltameter isillustrated in Fig. two outside platesform the anode, and arejoined together and toone binding post, whilethe cathode is placedbetween them and con-nected to the other bind-ing post. The cathodethus receives a depositon both sides. An adjustable arm serves to lower theplates into the electrolyte. A gas voltameter is describedin % 120. 119. Voltameter Calculations.—First : To calculate THE STRENGTH OF AN UNKNOWN CURRENT (iN AMPERES) WHICHHAS PASSED THROUGH A WEIGHT VOLTAMETER : Find the weight of metal deposited per second by dividing thetotal gain in weight by the time (in seconds) the current flowsthrough the instrument; divide this quotient by the weight depos-ited by one ampere in one second, and the result is the strengthof current expressed in amperes. Let C = current strength in amperes ;*W = total gain in weight; t = time in seconds current flows ;K = weight deposited by one ampere in one Fig. 98. -Construction of a WeightVoltameter. One cathode between two anodes. 96 PRACTICAL ELECTRICITY. Substituting for the above statement then : . weight gained Amperes = —-. — ryir- > ^ gain per ampere- sec. X time. «C = TT*t W- If W is expressed in grams: K for a copper voltameter is .0003286 gram; K for a zinc voltameter is .0003386 gram; K for a silver voltameter is .001118 gram; K for a sulphuric acid weight voltameter is .00009326gram; K for a sulphuric acid gas voltameter is .1733 cubic cen-timeter. Prob. 4: The negative plate of a copper voltameter has increasedin weight by grams in thirty minutes. What was the averagerate of current strength ? W 1 818 By Formula (4) 0—^ = 0003286 X 1800 = 3-073 anlPere8K for copper is .0003286, t = 30 minutes = 30 X 60 = 1800 : To find the weight of any metal that will BE DEPOSITED IN A VOLTAMETER BY A G
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