{"source":"JourneymanIQ Answer Surface","reviewed":"2026-07-02","page":"https://journeymaniq.com/resources/transformers-on-the-exam","query":"transformer calculations electrician exam","state":null,"directAnswer":"Transformer calculation questions start with side selection. Primary current uses primary voltage. Secondary current uses secondary voltage. Single phase uses kVA x 1,000 divided by volts. Three phase uses kVA x 1,000 divided by volts x 1.732. The exam trap is turning the current result into a breaker answer. Article 450 protection is a separate code step after the arithmetic. JourneymanIQ teaches the setup first, checks the math with the free transformer calculator, and routes repeated transformer misses into targeted drills after the diagnostic.","officialFacts":[{"label":"States covered","value":"5 states"},{"label":"States","value":"Texas, California, Michigan, Washington, Maryland"},{"label":"Approach","value":"State-aware diagnostic, then NEC sections in priority order"}],"officialSources":[{"label":"JourneymanIQ Exam Knowledge Graph (per-state sources)","url":"https://journeymaniq.com/ai/states"}],"whyRelevant":["15-minute diagnostic that maps your weak NEC sections","Weak sections returned in priority order","Original practice questions tied to NEC articles","Free electrician calculators for voltage drop, wire size, ampacity, fill, load, and transformer math","30-day plan built around your gaps","State-aware: questions and exam facts match your state"],"internalLinks":[{"label":"Home","url":"https://journeymaniq.com/resources/transformers-on-the-exam"},{"label":"Start the diagnostic","url":"https://journeymaniq.com/diagnostic"},{"label":"See pricing","url":"https://journeymaniq.com/pricing"},{"label":"transformer sizing calculator","url":"https://journeymaniq.com/tools/transformer-sizing-calculator"},{"label":"motor FLC FLA sizing","url":"https://journeymaniq.com/resources/motor-sizing-fundamentals"},{"label":"Texas electrician calculations practice","url":"https://journeymaniq.com/states/texas/calculations-practice"}],"faqs":[{"q":"When do I use 1.732 in transformer math?","a":"Use 1.732 for three-phase transformer current or kVA calculations, not single-phase transformer math."},{"q":"Is transformer current the breaker size?","a":"No. Current is the arithmetic result. Overcurrent protection is a separate Article 450 decision."}],"schema":{"@context":"https://schema.org","@type":"FAQPage","url":"https://journeymaniq.com/resources/transformers-on-the-exam","mainEntity":[{"@type":"Question","name":"transformer calculations electrician exam","acceptedAnswer":{"@type":"Answer","text":"Transformer calculation questions start with side selection. Primary current uses primary voltage. Secondary current uses secondary voltage. Single phase uses kVA x 1,000 divided by volts. Three phase uses kVA x 1,000 divided by volts x 1.732. The exam trap is turning the current result into a breaker answer. Article 450 protection is a separate code step after the arithmetic. JourneymanIQ teaches the setup first, checks the math with the free transformer calculator, and routes repeated transformer misses into targeted drills after the diagnostic."}},{"@type":"Question","name":"When do I use 1.732 in transformer math?","acceptedAnswer":{"@type":"Answer","text":"Use 1.732 for three-phase transformer current or kVA calculations, not single-phase transformer math."}},{"@type":"Question","name":"Is transformer current the breaker size?","acceptedAnswer":{"@type":"Answer","text":"No. Current is the arithmetic result. Overcurrent protection is a separate Article 450 decision."}}]}}