Download Introduction to Electronics by Theodore Korneff (Auth.) PDF

By Theodore Korneff (Auth.)

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Sample text

On the 250-volt range? 5-volt battery t o make an ohmmeter. Find the half-scale reading. D r a w the circuit and show c o m p o n e n t values. 1 Sinusoidal Voltage and Current A n important t y p e of voltage encountered in electronics is the sinusoidal voltage. This is a voltage whose magnitude and polarity are cyclic functions of time. This t y p e of voltage can b e reproduced b y means of special electronic circuitry or mechanically b y means of a generator. aT h re output e a s rm of e aan AC Circuits P ^ °f ac generator will b e used t o illustrate the sinusoidal voltage.

T h e sig­ nificance of the positive and negative signs here is that for the first half-cycle, slip ring A is positive with respect t o slip ring B} and during the second half-cycle, slip ring A is negative with respect to slip ring B. If w e complete an external circuit between the t w o slip rings, current will flow in the external circuit. 4) 44 / A C Circuits Since the voltage applied to the external circuit changes polarity every half-cycle, the current will d o likewise. F o r one half-cycle the current flows in one direction, increasing t o a m a x i m u m and then decreasing t o zero, changes direction and again increases to a m a x i m u m in the new direction, then decreases t o zero and begins t o repeat the cycle o v e r again.

Let NwBA = Em . 3) The plot of this equation is shown in Fig. 2. T h e quantity Em is the m a x i m u m value that the function can take. T h e potential e Fig. 2 A plot of the equation e = E sin 0. m 1§ o > is positive for the first half-cycle, then negative for the second halfcycle, and cyclically repeats this change in polarity. T h e sig­ nificance of the positive and negative signs here is that for the first half-cycle, slip ring A is positive with respect t o slip ring B} and during the second half-cycle, slip ring A is negative with respect to slip ring B.

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