Added `print names` for variables in `equivalent circuit model`

[medha-14]

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:

• No style issues: nox -s pre-commit
• All tests pass: nox -s tests
• The documentation builds: nox -s doctests
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[medha-14]

Can someone please review this and let me know if this is right or if some changes need to be made :)