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Page 69 - H2SO4, until no more sulphate remains and all the acid has been returned to the electrolyte. It will then be of the same strength as before the discharge and the same acid will be ready to be used over again during the next discharge. Since there is no loss of acid, none should be added to the electrolyte.
Page 16 - Rule. — If the current is flowing in the conductor away from the observer, then the direction of the lines of force will be around the conductor in the direction of the hands of a watch.
Page 11 - EMF on the magnet, which is directly proportional to the EMF, and inversely proportional to the resistance of the coil.
Page 14 - The power expended by an EMF of one volt through a resistance of one ohm. The power expended by one ampere through a resistance of one ohm.
Page 36 - If a mile of a certain copper wire having a diameter of -fa inch has a resistance of 14.06 ohms at 75° F., what will be the resistance between opposite faces of a cube measuring 1 inch on each side, that is, the resistance per inch cube ? Ans. .6808 microhm ELECTROSTATIC CAPACITY 43. The electrostatic capacity of a conductor is measured by the quantity of electricity with which it must be charged in order to raise its electric potential from zero to unity. To make the meaning clearer, let us consider...
Page 88 - H) are at right angles to each other and to the direction of propagation. The field stength is given by the RMS value of E in volts/m.
Page 69 - ... action which took place in the cells during discharge. It will be remembered that during discharge the acid of the solution went in and combined with the active material, filling its pores with sulphate and causing the solution to become weaker. Reversing the current through the sulphate in the plate restores the active material to its original condition and returns the acid to the solution.
Page 79 - Current passing in either direction (charge or discharge) decomposes the potassium hydrate of the electrolyte, and the oxidation and reductions at the electrodes are brought about by the action of its elements. An amount of potassium hydrate equal to that decomposed is always re-formed at one of the electrodes by a secondary chemical reaction, and consequently there is none of it lost and its density remains constant.
Page 79 - Starting with the oxide of iron in the negative, green nickel hydrate in the positive, and potassium hydrate in solution, the first charging of a cell reduces the iron oxide to metallic iron while converting the nickel hydrate to a very high oxide, black in color. On discharge, the metallic iron goes back to iron oxide and the high nickel oxide goes to a lower oxide but not to its original form of green hydrate. On...