Electromechanical Design Handbook, Third Edition
By Ronald A. Walsh

6.3: DECIBELS

6.3 DECIBELS

The number of decibels (dB) by which two power outputs P 1 and P 2 (in watts) may differ is given by

In terms of volts

In terms of current

Power ratios are independent of source and load impedance values. Voltage and current ratios in the preceding formulas hold true only when source and load impedances are equal. When these impedances differ, the ratios are then given by

Copyright The McGraw-Hill Companies, Inc. 2000 under license agreement with Books24x7
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