. Electronic apparatus for biological research . Figure figure Reactance The value of a resistance in ohms is given by the ratio of potential difference to current; the analogous property of a capacitance is also measured in ohms and is called the capacitive reactance, symbol X^. Numerically it equals VJimCV) — IjiojC), the phase difference represented by the sine and cosine terms being ignored. Capacitive reactance is conventionally regarded as being negative in sign, for a reason which appears in Chapter 5. Power in capacitances In Figure the instantaneous power supphed to the ca

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. Electronic apparatus for biological research . Figure figure Reactance The value of a resistance in ohms is given by the ratio of potential difference to current; the analogous property of a capacitance is also measured in ohms and is called the capacitive reactance, symbol X^. Numerically it equals VJimCV) — IjiojC), the phase difference represented by the sine and cosine terms being ignored. Capacitive reactance is conventionally regarded as being negative in sign, for a reason which appears in Chapter 5. Power in capacitances In Figure the instantaneous power supphed to the capacitance is P= vi = Fsin cot. coCV cos cot = V^Cco sin cot. cos cot = ^V^Cojsinlcot This function moves positive and negative symmetrically, which means that power surges back and forth into the capacitance and out again. On the average the power supplied is iV^Cco 1 n^ 2-n-Jo sin 2cot dt = 0 Therefore, no power is consumed by a capacitance. 1/4

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