A product works with four alkaline cells but stops working when they are replaced by four fully charged NiMH cells. What is the most likely explanation?
NiMH cells can supply power only to motors and not to electronic circuits
NiMH cells have a higher voltage that is likely to destroy the circuit
Four NiMH cells provide only 4.8 V, which may be below the circuit's required voltage
Connecting rechargeable cells in series reduces their voltage to zero
A student proposes connecting a partly discharged cell directly in parallel with a fresh cell of the same type. What problem should the designer identify?
A battery-powered trail marker meets its runtime target in a warm classroom but switches off earlier during winter trials. No settings or components have changed. Which explanation should the designer investigate first?
True or False: Reducing a product's current draw can reduce the number of disposable batteries used over its working life, even when the battery type stays the same.
A school greenhouse controller needs to switch a 230 V heater. Which approach best follows the stated mains safety rules?
Practice MYP MYP Design Topic Power Sources and Energy Efficiency with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for Power Sources and Energy Efficiency and mirrors Paper 1, 2 style where relevant.
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