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The resonant frequency can also be determined through the use of a reactance chart developed by the Bell Telephone Laboratories (Fig. 21). This chart can be used for solving problems of inductance, capacitance, frequency, and impedance. If two of the values are known, the third and fourth values may be found with its use. Defining Terms Air capacitor: A fixed or variable capacitor in which air is the dielectric material between the capacitor’s plates. Ambient temperature: The temperature of the air or liquid surrounding any electrical part or device.
Most high-frequency resistors have a length to diameter ratio between 4:1 to 10:1. Dielectric losses are kept to a minimum by proper choice of base material. Voltage Coefficient of Resistance Resistance is not always independent of the applied voltage. The voltage coefficient of resistance is the change in resistance per unit change in voltage, expressed as a percentage of the resistance at 10% of rated voltage. 8) where R1 is the resistance at the rated voltage V1 and R2 is the resistance at 10% of rated voltage V2.
28) and is always larger than the largest capacitor. When a voltage is applied across a group of capacitors connected in series, the voltage drop across the combination is equal to the applied voltage. The drop across each individual capacitor is inversely proportional to its capacitance. ,Cn ), V; VA = applied voltage, V; CT = total capacitance of the series combination, F; and CX = capacitance of individual capacitor under consideration, F. 30) where XC = capacitive reactance, W ; f = frequency, Hz; and C = capacitance, F.