A supplied energy and budget comparison

A fictional school compares two low-voltage demonstration systems that provide the same measured service under the exercise conditions. System A draws two hundred watts for three hours, while System B draws one hundred fifty watts for four hours. The coordinator calls B more energy efficient solely because its power rating is smaller. A second student notes that the classroom trial did not include standby operation, maintenance or the upstream electricity supply. Both systems have documented guards and are operated only by authorized staff; the task concerns interpreting supplied measurements, not altering equipment. The group must calculate the energy used in the stated sessions and distinguish that result from an annual cost or lifecycle comparison. No current tariff, emissions factor or equipment safety limit is supplied. Any further numerical conclusion must therefore identify additional assumptions rather than inventing them.