電工二種ドリル − 複線図・計算・図記号
Preparation for the written (theory) and practical exams of the Class 2 Electrician's License. Includes practice in wiring diagrams, calculation drills with constantly changing values, and diagram symbol quizzes. One-time purchase, no ads, and works offline.
About 電工二種ドリル − 複線図・計算・図記号
This learning drill is specifically designed for the "hands-on" portion of the Second-Class Electrician's License exam. It allows you to repeatedly practice three key areas that are difficult to master through simple question-and-answer exercises: the wiring diagrams for the practical skills test, the calculation problems for the written (theory) exam, and the symbols used in wiring diagrams—all during spare moments.
● Wiring Diagrams: Mastered Through Procedure
Includes 13 candidate problems from the 2026 exam. "Where should the ground wire (white) be connected first?" "To which device should the switch's return wire be connected?"—Each time you correctly answer a multiple-choice question, a wire is drawn on the diagram. The standard "white → black → return wire" pattern becomes ingrained as the drawing order, rather than simply memorizing the completed diagram.
* 3-way switch, 3-way + 4-way jumper wire
* Difference between always-on and simultaneous flashing of pilot lamps
* Time switch, automatic flashing device (terminal block) terminals 1, 2, and 3
* Single-phase 200V circuit (black, red + ground green), three-phase 200V circuit
* Grounded outlet and grounding wire
You can check your stumbling blocks by working through each problem one by one.
● Calculation problems are "infinite practice"
7 fields: equivalent resistance / wire resistance / power and energy / single-phase AC / three-phase AC / voltage drop / allowable current. Since the values change with each question, you won't end up memorizing the answers and losing the practice value. All questions include explanation steps: "formula → substitution → answer". All answers to the generated problems are verified with the app's built-in calculation engine.
● Memorize symbols with "quizzes"
Lamp receptacles, ceiling roses, 3-way switches, grounded outlets, junction boxes... You can repeatedly practice frequently appearing symbols in wiring diagrams with 4-choice quizzes.
● Skill Test Mode
This section consolidates all the "knowledge preparation" needed for the skills test (40 minutes; failure due to even one defect) into one place.
* Ring Sleeve Marking Drill: Practice determining the sleeve size and crimp mark (circle, small, medium) based on the wire thickness and number of wires to be connected. The app incorporates the publicly available combination table (compliant with JIS C 2806), and all generated problems are machine-verified.
* Defect Judgment Quiz: Practice judging "Is this a defect?" with quotes from the publicly available judgment criteria. Learn numerical standards such as how many millimeters of exposed core wire constitute a defect, or what constitutes a chipped base.
* Skill Strategies for 13 Candidate Problems: For each problem, the key points for reading construction conditions, wire configuration and sleeve/marking at each connection point, and essential points for equipment installation are summarized. This also connects to practicing the wiring diagram procedure.
* Items to Bring & Day-of Guide: Tool list, material rules, and a 40-minute time management template.
●Pre-Exam Practice Tests (3 Sets)
Includes three full practice tests in the same format as the actual exam (50 questions, 120 minutes). Features a timer and answer progress grid, allowing you to resume from where you left off if interrupted. After scoring, it displays the passing score (approximately 60 points), correct answer rate by subject area, weak areas, and explanations for all questions. Performance history and best records for each test are also saved, making it useful for checking your preparation in the final stages.
●Start for Free, Purchase If Needed
You can try the following for free: 3 calculation areas, 3 wiring diagram questions, 10 types of symbols, basic sleeve drills, 8 defect judgment questions, 1 candidate problem, skill strategy guide, day-of guide, and a trial of the pre-exam practice test (first 10 questions). Pro (one-time purchase, in-app purchase) unlocks all 7 calculation areas, all 13 candidate problems, and all symbols. Skill Pack (one-time purchase, in-app purchase) unlocks practical drills in skill test mode, all defect judgment questions, and 13 skill strategy questions. The mock exam pack (one-time purchase/in-app purchase) unlocks three mock exams for the final preparation period. There are no monthly fees or advertisements. All learning functions work offline, so you can use it during breaks on site or while traveling in areas without a signal.
[Caution]
This app is an unofficial app designed to assist with studying for the Class 2 Electrician's License Examination and is not affiliated with the examination administering body (Japan Electrical Engineers Examination Center). The content included is learning material created independently based on publicly available materials and does not guarantee passing the exam. In the actual exam, please follow the construction conditions specified in the exam questions.
