By Leo G Sands
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Extra info for Electronics handbook for the electrician
Sample text
SUMMARY Resistors are used in electronic devices to reduce voltage (signal or operating potential) and to limit current, as well as for signal isolation and mixing purposes. Fixed resistors are used by the billions each year. Variable resistors are used for controlling signal and operating voltage levels and for altering the operating characteristics of electronic devices, as well as for mixing signals. 31 3 :• Inductance :• And : Capacitance Next to resistors, inductors and capacitors are the most widely used passive electronic components.
AC Rows through a capacitor, since it is alternately charged and discharged. The resistance of the Row of AC is known as inductive reactance, which is determined by the value of capacitance and the frequency of the AC. OOI-microfarad capacitor is about 270,000 ohms at 60 Hz (cps ). I-mf capacitor at the same frequency is one tenth as high. If the frequency of the AC is increased, the reactance is decreased. OI-mf capacitor is so low that it acts as a short circuit to the RF signal and as an open circuit to DC.
In the case of house current, for example, the RMS voltage is said to be approximately 115 volts. 4 times 115, or 161 volts, and the peak-to-peak voltage is 322 volts. When AC is applied to a perfect capacitor, the current leads voltage by 90 (one quarter of a cycle); or it can be said that voltage lags current by 90 When AC is applied to a perfect inductance, the current lags the voltage by 90 0 ; but when AC is applied to a resistor, the current and voltage are in phase with each other. When AC is applied to a coil, the current is zero at the time the applied voltage is highest, and increases as the voltage drops.