Viva practice
Exam-style questions generated from the component library — practice like it's the real viva.
Instant feedback after every question, with worked solutions.
Every question is multiple choice with 4 options. Components you've missed before show up more often, rounds rotate through the question bank so repeats stay rare, and "All categories" rounds mix in circuit-law calculations.
What the power sources & storage quiz asks
Questions are generated from this site’s own reference pages for the 8 power sources & storage parts below — batteries, cells, supplies — the juice. Because each one is built from a specific field of a specific part, a wrong answer always has somewhere to send you: the component page the question came from. Nothing here is a fixed question list, so no two runs are identical.
Question types in this category
Example questions
The real prompts, shown against the battery (li-ion / lipo / lifepo4).
- How do you choose the right Battery (Li-ion / LiPo / LiFePO4) for a job?
- What are the common ways a Battery (Li-ion / LiPo / LiFePO4) fails?
- What does a Battery (Li-ion / LiPo / LiFePO4) do?
- Which key specs matter when choosing a Battery (Li-ion / LiPo / LiFePO4)?
- How do you read the value or markings on a Battery (Li-ion / LiPo / LiFePO4)?
Parts you’ll be asked about
Every one has a reference page with specs, testing procedure and failure modes.