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Learn the skill
For constant power, energy E = P x t. Use power in watts and time in seconds to get energy in joules (J). A longer interval does not by itself change the power. If two separate intervals occur one after the other, add their energies. Use only the stated model records; no real equipment or waiting is needed.
Worked example
A constant 2 W model transfers 2 x 3 = 6 J in 3 seconds. In 6 seconds it transfers 12 J. Time and energy doubled, but power stayed 2 W. Do not add the 3-second comparison to the 6-second comparison unless they are stated to be separate successive intervals.
