What does a voltage describe

a how fast a current can flow
b how much current can flow
c how much a material resists electrical flow
d how fast a material conducts electrical flow

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i need an image of the diagram

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave