Added print names
for variables in equivalent circuit model
#4898
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Description
Fixes #3036
I have given latex friendly symbols to variables in the equivalent circuit model
Initially the output was:

After the latex names are given:

Type of change
Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #)
Important checks:
Please confirm the following before marking the PR as ready for review:
nox -s pre-commit
nox -s tests
nox -s doctests