For the notation of Voltsecond and Volt-mu-second

[NexusN]

Homework Statement

I have a question regarding the difference in the two notation found in the book, Switching Power Supply A to Z, on page 75(sorry I cannot show it here),

It read something like this:

We know that current swing is voltseconds per unit inductance. So we can also write

I = Et/L_{μH} (any topology)
Here ‘Et’ is defined as the (magnitude of the) voltμseconds across the inductor (either during
the on-time or off-time — both being necessarily equal in steady state)

Over here, is that the 'E' in 'Et' meaning energy? Or it simply represents 'V'? Or 'Et' itself is a single, non-separable term?
And should I write Voltsecond in V-t?

Is V-t = Et in nature, with Et = V-t x mu(10^-6)?

Thank you for your attention.

Homework Equations

The Attempt at a Solution

 

[Valkarie]

It looks like 'Et' is a single, non-separable term, meaning the magnitude of the voltμseconds across the inductor. So it would be written as Vμs. V-t = Et in nature, with Et = V-t x mu(10^-6).