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By Noel M. Morris (auth.)

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Each atom is made up of electrons, protons and neutrons. The electron has a negative charge and the proton a positive charge; the two electrical charges are equal and opposite, but the mass of the proton is 1840 times greater than that of the electron. Current flow is a combination of electron flow (negative charge carriers) and hole flow (positive charge carriers). 13 A conductor offers low resistance to current flow, an insulator offers high resistance. The resistance of a semiconductor is mid-way between the two extremes.

F. 2. f. of the copper-zinc cell is the dif terence in potential between the elements. 1 v. f. 4) which can be predicted from the table of electrochemical elements. d. , E; this voltage is known as the no-load terminal voltage of the cell. When the load resistance, R, is connected, a current flows through the cell; that is, it flows not only through the electrolyte but also through the contact between the electrolyte and the electrodes. , E. The potential drop in the internal resistance r (known as the internal voltage drop) of the cell causes the terminal voltage, Vr, under 'loaded' conditions to be less than the no-load terminal voltage, E.

1) 18 or number ofions,N= Q ze Michael Faraday discovered this relationship in 1833, and stated two laws which govern electrolysis as follows: First law: The mass of material deposited (or gas released) is proportional to the quantity of electricity (current x time) which passes through the electrolyte. 8 ampere hours of electricity is equal to the chemical equivalent of that material. Example When an electrical current passes through a solution of sodium chloride in water, sodium hydroxide and hydrochloric acid are produced.

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