[Article] A Study of Absorption Spectra with the Electric by King A.S.

By King A.S.

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Extra info for [Article] A Study of Absorption Spectra with the Electric Furnace

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This E field terminates on induced charges on external conductors. This leakage of the E field is described correctly as a mutual capacitance. If the E field varies, the induced charges must change. This changing charge implies current flow, which can be a source of a signal in an external circuit. The signal in the cable is said to be coupled to an external conductor through a mutual capacitance. This capacitance is also called a leakage capacitance. In most examples, leakage capacitances are on the order of a few picofarads per foot of cable.

At the moment of switch closure, all the battery voltage appears across the resistor. This voltage across the resistor means that there is a current flow equal to V=R. This current flow will begin to place charge on the capacitor plates. As the charge builds up on the plates, the E field will increase between the plates. 5 Series RC circuit. 28 CAPACITORS, MAGNETIC FIELDS, AND TRANSFORMERS This E field implies a voltage across the plates of the capacitor. The sum of the voltages across the resistor and the capacitor must equal the impressed voltage.

11, current is simply charge per unit time, or Q=t. By letting Q=t = A, the power becomes volts # amperes, or P = VA. If the voltage is 10 V and the resistor is 1000 ­, the current is 10 mA. 1 W. 1 J of energy is dissipated in the resistor in each second. 17 RESISTOR DISSIPATION When current flows in a resistor, it dissipates heat. The temperature rise will depend on its radiating surface and on how the resistor is cooled. In most commercial applications it is a good idea to limit dissipation to about onehalf the rating.

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