In module electricpy.conversions, watts_to_dbw() does not guard against non-positive inputs (domain error / -inf)

[marcostfermin]

Describe the bug

watts_to_dbw(watt) computes 10 * log10(watt) directly. For watt <= 0, this produces -inf (0) or nan/warnings (negative). For a conversion utility, this should usually raise a clear ValueError.

https://electricpy.readthedocs.io/en/latest/_modules/electricpy/conversions.html

Reproduction Code

# Setup
import electricpy.conversions as conv

print(conv.watts_to_dbw(0))     # log10(0) -> -inf
print(conv.watts_to_dbw(-1.0))  # log10(negative) -> nan / runtime warning

Expected behavior

A clear exception (e.g., ValueError("watt must be > 0")) rather than returning -inf/nan silently.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. Linux]
• Python Version [e.g. 3.11.6]
• Version [e.g. 0.4.0]

Additional context

This one’s “edge-case,” but it’s a common footgun in unit conversion helpers.