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Ripple (physics)

It has been suggested that this article or section be merged with Capillary waves. (Discuss)

In physics, ripples (also known as capillary waves) are surface waves on a liquid with wavelengths so short that the liquid's motion is governed almost entirely by surface tension forces. The wavelength of a ripple must be less than

$\lambda_c = 2 \pi \sqrt{ \frac{\gamma}{\rho g}}$

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where:

γ is surface tension
ρ is liquid density
g is acceleration due to gravity

For water, λ_c is found to be 1.7 cm.

Electrical significance

In electricity, ripple is the alternating current component from a direct current power supply arising from sources within the power supply. Unless otherwise specified, percent ripple is the ratio of the root mean square value of the ripple voltage to the absolute value of the total voltage.

The ripple voltage can be calculated from the following equations:

Full-wave rectification:

$V_\mathrm{r} = \frac{I}{2fC}$