No, rpenner made a stupid mistake saying "local" is infinitesimal, which means you can't measure the local speed of light because light can't move any distance.

It's a limiting case, like various other limiting cases.

Farsight, that's a big problem with your qualitative approach to physics. It does not capture the sizes of effects very well, if at all.

Electrons have the same charge as antiprotons, which when you flip the sign is the same as that of the positron and proton. They have unit charge. It's not just a simple interaction strength.

Interaction strengths can have their signs reversed.

The standard model is incomplete, remember? It doesn't model the electron,

The Standard Model *does* have a model of the electron, but it's a model that you refuse to accept.

In the Standard Model with unbroken electroweak symmetry, there are two lepton fields:

Left-handed lepton:

Generations: 3

Weak isospin: 2

Space-time: 2 (Majorana spinor)

Right-handed charged lepton:

Generations: 3

Weak isospin: 1

Space-time: 2 (Majorana spinor)

They interact with the Higgs particle in fashion (coupling constants).(LHL).(RHCL).(Higgs) where the coupling constants are a 3*3 matrix with both indexes for generations. Putting in the indexes gets roughly

(CC's)[sub]gen 1, gen 2[/sub] * (LHL)[sub]gen 1, WIS, ST[/sub] * (RHCL)[sub]gen 2, ST[/sub] * (Higgs)[sub]WIS[/sub]

With electroweak symmetry breaking, the left-handed lepton breaks in two, and we get:

Left-handed neutrino

Left-handed charged lepton

Right-handed charged lepton

All:

Generations: 3

Space-time: 2 (Majorana spinor)

The Higgs particle gets a nonzero Vacuum Expectation Value, and it multiplies the interaction between the LHCL and the RHCL. This gives us

(Higgs VEV) * (CC"s)[sub]gen 1, gen 2[/sub] * (LHCL)[sub]gen 1, ST[/sub] * (RHCL)[sub]gen 2, ST[/sub]

The LHCL and the RHCL act as one charged-lepton Dirac spinor:

Generations: 3

Space-time: 4 (Dirac spinor)

and the Higgs VEV times the Higgs CC's make a "mass matrix":

(Mass matrix)[sub]gen 1, gen 2[/sub] * (CL)[sub]gen 1, ST[/sub] * (CL conjugate)[sub]gen 2, ST[/sub]

One can diagonalize the mass matrix, as its called, and when one does that, one has decomposed the charged-lepton fields into an electron field, a muon field, and a tau-lepton field. Each one is a Dirac spinor, a field with 4 space-time components that transforms as a spinor under rotations and boosts.

or explain what charge actually is.

It does: strength of gauge interaction. Do you want for me to explain gauge theories?