2.4.69 - Electrical power and energy

Use P = VI and W = VIt, and derive and use P = I²R and P = V²/R.

Use - electrical power and energy to connect the rule to the data and decision in the question.

This matters because - electrical power and energy determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - electrical power and energy to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Electrical power and energy is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.