## Name of 2nd time derivative of charge q?

## Name of 2nd time derivative of charge q?

(OP)

For charge q, the first time derivative dq/dt is the current i. The 2nd time derivative is d^2q/dt^2. Is there a name for this?

By analogy, for a mechanical system the displacement is u and the first time derivative du/dt is the velocity. The 2nd time derivative d^2u/dt^2 is the acceleration.

Thanks,

Don C.

By analogy, for a mechanical system the displacement is u and the first time derivative du/dt is the velocity. The 2nd time derivative d^2u/dt^2 is the acceleration.

Thanks,

Don C.

## RE: Name of 2nd time derivative of charge q?

xnuke

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## RE: Name of 2nd time derivative of charge q?

TTFN

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## RE: Name of 2nd time derivative of charge q?

The 2nd time derivative of charge is used for the voltage drop across an inductor -- V = L d^2q/dt^2 = L di/dt. I'd like to refer to this derivative textually in the same manner as one would refer to "acceleration" (i.e., without having to continually refer "2nd time derivative of charge" or "2nd time derivative of displacement").

## RE: Name of 2nd time derivative of charge q?

Yes, I forgot about that. But, that's just referred to as "ell dee eye dee tee" and there is no specific physics symbol for that quantity, so no name either.

TTFN

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## RE: Name of 2nd time derivative of charge q?

Electrical engineering doesn't have position, velocity, accelleration, but we're just

jerks. [bigsmile]## RE: Name of 2nd time derivative of charge q?

Bill

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## RE: Name of 2nd time derivative of charge q?

inverseof rise time."Current rate of change" is the only name that I recall.

## RE: Name of 2nd time derivative of charge q?

As you mention in mechanical systems there is position, velocity, acceleration, jerk, and Ping.

## RE: Name of 2nd time derivative of charge q?