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By Peter-Ferdinand Koch

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The less noble metal becomes the anode and the more noble acts as the cathode. As a result, the less noble metal corrodes and the more noble metal is protected. Metallic oxides are always less strongly electronegative, i. e. nobler in the electrolytic sense, than the pure metals. Electrolytic potential differences can therefore also occur between metal surfaces which to the engineer appear very little different. Even though the potential differences for cast iron and steel, for example, with clean and rusty surfaces are small, as shown in Table 1-9, under suitable circumstances these small differences can nevertheless give rise to significant direct currents, and hence corrosive attack.

T T The equivalent d. c. value of an alternating current is the average, taken over one period, of the value:  i = 1T 1 2π i dt = i dω t . ∫  ∫  T0 2π 0 This occurs in rectifier circuits and is indicated by a moving-coil instrument, for example. The root-mean-square value (rms value) of an alternating current is the square root of the average of the square of the value of the function with respect to time. I = 1 T 2 1 2π 2 ⋅ ∫ i dt = ⋅ ∫ i dω t . T 0 2π 0 As regards the generation of heat, the root-mean-square value of the current in a resistance achieves the same effect as a direct current of the same magnitude.

I The harmonic content k (distortion factor) is the ratio of the rms value of the harmonics to the rms value of the alternating current. Ίෆෆෆ I 22 + I 23 + … k = —————— = I Ίෆ 1 –ෆ g 2 The fundamental oscillation content and the harmonic content cannot exceed 1. In the case of a sinusoidal oscillation the fundamental oscillation content the harmonic content g = 1, k = 0. 53 Forms of power in an alternating-current circuit The following terms and definitions are in accordance with DIN 40110 for the sinusoidal wave-forms of voltage and current in an alternating-current circuit.

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