Improved docs

[AurelienJaquier]

Description

Add an explanation about interpolation, time, voltage and current in the docs.

Checklist:

• Unit tests are added to cover the changes (skip if not applicable).
• The changes are mentioned in the documentation (skip if not applicable).
• CHANGELOG file is updated (skip if not applicable).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.80%. Comparing base (2cddd26) to head (247cf26).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #389      +/-   ##
==========================================
+ Coverage   91.73%   91.80%   +0.07%     
==========================================
  Files          36       37       +1     
  Lines        6278     6956     +678     
  Branches     2033     2242     +209     
==========================================
+ Hits         5759     6386     +627     
- Misses        266      298      +32     
- Partials      253      272      +19     

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[anilbey]

Great