Tsai Electro / Electrical Foundation
Twelve skills. Three questions each. One clear next step.
Start with free practice in apprenticeship entry, math, safety awareness, and electrical theory. Every skill has a short lesson and three original questions with answer explanations.
How to check each skill: Answer all three questions, then select Check all three. A result of 3/3 counts as complete for this visit only. You can retry without penalty. Results are not saved to a member account, are not formal competency verification and do not count toward state licensing, continuing education, supervised work hours or field authorization.
Optional: Save a practice attempt. After getting 3/3 on a topic, choose Save this practice result. With a signed-in account, this submits an ordinary practice attempt to the site’s existing learning-record system and checks the server response. For guests, it is held in this browser for transfer after sign-in, subject to browser storage settings. It is never a formal SKL skill pass, job authorization, CE, or licensing credit. No score is sent to an account without your explicit action.
These starter-topic research associations are not a complete exam syllabus or licensing checklist. Changing the goal will not clear your practice answers during this visit.
12 starter topics shown01. Choose a sound starting point
Understand licensing, selection and measurement basics.
State license versus practice results
A TDLR-issued Apprentice Electrician license is a legal credential; a practice-pack score or training attendance is different.
QUESTION 1 OF 3
A beginner gets 90% on an online practice test. Which conclusion follows?
Show answer and explanation
Answer: They completed a practice assessment, not a license application.. A practice result is not evidence of a TDLR-issued credential.
QUESTION 2 OF 3
Who issues an official Texas Apprentice Electrician license?
Show answer and explanation
Answer: The Texas Department of Licensing and Regulation (TDLR). TDLR is the state licensing authority. Employer screening and practice websites do not issue the state credential.
QUESTION 3 OF 3
Under whose general supervision may a licensed Texas Electrical Apprentice perform electrical work?
Show answer and explanation
Answer: A licensed Master Electrician, Journeyman Electrician, or Residential Wireman, as applicable. The TDLR Apprentice application page specifies general supervision by a Master, Journeyman, or Residential Wireman. Work must also remain within applicable scope and exemptions.
Identify the sponsor's screening
A state Apprentice Electrician license does not have a mandatory entrance exam. Employers and training sponsors may screen applicants separately.
QUESTION 1 OF 3
Two apprenticeship sponsors use different screening tests. What should an applicant do?
Show answer and explanation
Answer: Read each current sponsor's requirements and prepare for the applicable assessment.. State licensing and sponsor selection are separate processes.
QUESTION 2 OF 3
A private apprenticeship sponsor requires a math entrance assessment. What kind of requirement is it?
Show answer and explanation
Answer: An employer or sponsor selection requirement. A sponsor's selection process is separate from a state license application, which requires no entrance exam.
QUESTION 3 OF 3
Your target sponsor lists an interview but no aptitude test. What is the most useful next preparation step?
Show answer and explanation
Answer: Prepare for that published interview and verify the current application steps. Use the actual requirements published for your chosen organization instead of buying an unrelated test package.
Add mixed fractions
To add fractions, find a common denominator, combine the fractions and simplify. Keep the measurement unit with the result.
QUESTION 1 OF 3
A written measurement is 1½ inches plus ¾ inch. What is the total?
Show answer and explanation
Answer: 2¼ inches. 1 + 2/4 + 3/4 = 2¼ inches. This is paper mathematics, not a field instruction.
QUESTION 2 OF 3
What is 2⅜ + 1¼ in a written measurement exercise?
Show answer and explanation
Answer: 3⅝. 1¼ is 1 2/8. Adding 2 3/8 + 1 2/8 gives 3 5/8.
QUESTION 3 OF 3
What is 4½ − 1¾ in a paper measurement problem?
Show answer and explanation
Answer: 2¾. Convert to quarters: 4 2/4 − 1 3/4 = 3 6/4 − 1 3/4 = 2 3/4.
Convert feet to inches
One foot contains 12 inches. Multiply the length in feet by 12 to convert it to inches.
QUESTION 1 OF 3
How many inches are in 2.5 feet?
Show answer and explanation
Answer: 30 inches. Multiply feet by 12: 2.5 × 12 = 30 inches. The answer is an inch measurement, not 30 feet.
QUESTION 2 OF 3
A drawing lists 3 feet 7 inches. How many inches is that?
Show answer and explanation
Answer: 43 inches. 3 feet equals 36 inches. Add 7 inches to get 43 inches.
QUESTION 3 OF 3
How do you express 66 inches as feet and inches?
Show answer and explanation
Answer: 5 feet 6 inches. 66 ÷ 12 is 5 whole feet with 6 inches remaining.
02. Know when to stop and ask
Recognize hazards and how protective equipment responsibilities work.
Stop work when a hazard is unknown
An unverified electrical condition is not safe simply because it looks inactive. Stop and use the employer's authorized escalation process.
QUESTION 1 OF 3
A helper cannot establish the status of an exposed conductor. What is the appropriate action?
Show answer and explanation
Answer: Stop and notify the qualified supervisor before handling.. Uncertain electrical conditions require an authorized safe-work process. A quiz does not authorize testing or handling.
QUESTION 2 OF 3
You see a damaged tool cord before a task. Which action best reflects safe awareness?
Show answer and explanation
Answer: Report the damaged tool and follow the employer's safe-work procedure. Damaged electrical equipment must be addressed through the employer's approved inspection and removal process. A knowledge quiz cannot qualify someone to repair it.
QUESTION 3 OF 3
A helper is asked to begin an electrical task without a qualified supervisor available. What should they do?
Show answer and explanation
Answer: Wait for authorized direction and clarification. A helper should not use guesswork or an online practice result to establish work authorization or safe conditions.
Separate PPE from personal purchases
OSHA generally requires employers to pay for PPE needed to comply with applicable rules, subject to specific exceptions. Verify employer-provided equipment first.
QUESTION 1 OF 3
A shopping checklist says an apprentice must buy all required PPE. What should they do?
Show answer and explanation
Answer: Check the employer's provision and OSHA payment exceptions.. Most required protective equipment is an employer obligation, with defined exceptions.
QUESTION 2 OF 3
Who generally pays for specialty PPE needed to comply with OSHA construction standards?
Show answer and explanation
Answer: The employer, subject to the defined payment exceptions. Under OSHA 1926.95(d), the employer generally provides required protective equipment at no cost to the employee, with specified exceptions.
QUESTION 3 OF 3
Which item can fall within OSHA's stated employer-payment exception when it is non-specialty and may be worn off-site?
Show answer and explanation
Answer: Non-specialty safety-toe protective footwear. OSHA identifies non-specialty safety-toe footwear and certain prescription safety eyewear as possible exceptions under specified conditions.
03. Understand simple circuits
Use paper circuit models and check the relevant code edition.
Voltage, current and resistance
Voltage is measured in volts (V), current in amperes (A), and resistance in ohms (Ω). These are different quantities.
QUESTION 1 OF 3
Which unit measures current?
Show answer and explanation
Answer: Amperes. Current is in amperes (A). Voltage is in volts (V) and resistance in ohms (Ω).
QUESTION 2 OF 3
Resistance in a basic circuit problem is expressed in which unit?
Show answer and explanation
Answer: Ohms. Electrical resistance uses ohms (Ω); current uses amperes and power uses watts.
QUESTION 3 OF 3
The unit symbol V usually represents what in basic electrical equations?
Show answer and explanation
Answer: Voltage in volts. Voltage is expressed in volts (V), not amperes or ohms.
Ohm's law on paper
For a simple ohmic element, I = V/R. Use consistent units and verify the mathematical assumptions.
QUESTION 1 OF 3
A theoretical 24 V source is applied across an 8 Ω resistor. What current results?
Show answer and explanation
Answer: 3 A. I = 24/8 = 3 A. A calculation alone does not authorize a field measurement.
QUESTION 2 OF 3
An ideal resistor has 18 V across it and a resistance of 6 Ω. What current flows in the paper model?
Show answer and explanation
Answer: 3 A. Ohm's law gives I=V/R=18/6=3 A under the stated model assumptions.
QUESTION 3 OF 3
A simple ohmic element has 30 V and 5 A in a theoretical exercise. What resistance is implied?
Show answer and explanation
Answer: 6 Ω. Rearrange Ohm's law as R=V/I=30/5=6 Ω.
Series resistance
For ideal resistors connected in a single series path, equivalent resistance is the sum of each resistance.
QUESTION 1 OF 3
A theoretical circuit has 3 Ω and 5 Ω in series. What is the total resistance?
Show answer and explanation
Answer: 8 Ω. For resistors in the same series path, R_total = 3 + 5 = 8 Ω. No reciprocal calculation is needed.
QUESTION 2 OF 3
Resistors of 2 Ω, 7 Ω, and 1 Ω are connected in series. What is the equivalent resistance?
Show answer and explanation
Answer: 10 Ω. In a series path, resistances add: 2+7+1=10 Ω.
QUESTION 3 OF 3
A single series path already contains 6 Ω. Adding a 4 Ω resistor in series gives which total?
Show answer and explanation
Answer: 10 Ω. The additional resistance increases the series total to 6+4=10 Ω.
Parallel resistance
For two ideal resistors in parallel, 1/R_total = 1/R1 + 1/R2. Equivalent resistance is smaller than either branch resistance.
QUESTION 1 OF 3
A paper circuit has 6 Ω and 3 Ω resistors in parallel. What is the equivalent resistance?
Show answer and explanation
Answer: 2 Ω. 1/R = 1/6 + 1/3 = 1/2, giving 2 Ω.
QUESTION 2 OF 3
Two ideal 10 Ω resistors in parallel have what equivalent resistance?
Show answer and explanation
Answer: 5 Ω. For two equal resistances in parallel, the equivalent resistance is one half of either value: 5 Ω.
QUESTION 3 OF 3
An ideal 4 Ω and 12 Ω resistor are in parallel. What is their equivalent resistance?
Show answer and explanation
Answer: 3 Ω. R=(4×12)/(4+12)=48/16=3 Ω.
Electric power calculation
In a simple circuit model, electrical power is P = IV. Volts multiplied by amperes give watts (W).
QUESTION 1 OF 3
A theoretical component operates at 12 V and 2 A. What is its power?
Show answer and explanation
Answer: 24 W. 12 × 2 = 24 W. The result alone cannot establish safe equipment sizing.
QUESTION 2 OF 3
A theoretical component carries 3 A at 9 V. What electric power does P=IV give?
Show answer and explanation
Answer: 27 W. P=9×3=27 watts in the simple circuit model.
QUESTION 3 OF 3
A theoretical device is described as 60 W at 12 V. What current does I=P/V give?
Show answer and explanation
Answer: 5 A. I=P/V=60/12=5 A. The paper calculation does not establish whether any real device is safe to install.
Check the applicable electrical code
A code lookup must identify the applicable edition, scope and any Texas or local exceptions. A prior edition may not control the current scenario.
QUESTION 1 OF 3
You find a rule in an old NEC edition. What comes next?
Show answer and explanation
Answer: Check the adopted edition, exceptions and exact use case.. Establish the currently applicable requirements and conditions before relying on a rule.
QUESTION 2 OF 3
A Texas municipality has local electrical requirements. Which information should you check before applying a code example?
Show answer and explanation
Answer: The adopted code version and applicable local requirements. The correct source depends on the adopted code edition, scenario and applicable local authority.
QUESTION 3 OF 3
Texas adopted the 2026 NEC with a limited exception for certain outdoor outlet GFCI rules. What follows for a specific problem?
Show answer and explanation
Answer: The edition, exception and installation context must be checked before relying on a provision. TDLR's September 2026 adoption included a limited exception; code lookups must identify the applicable scope and adopted edition.
What should you learn next?
Explore the 28-branch Texas career skill tree and choose your next role. Reuse existing guides and tools rather than buying duplicate materials. Field practice still requires appropriate qualified supervision, and any state credential must be checked with the licensing authority.
