49 free practice questions for this exam, each with the reason for the answer and where to look it up.
10 questions, graded as you go, with the reason for every answer. No sign-up.
Engine repair, brakes, electrical, suspension and steering, heating and air conditioning, engine performance and maintenance, in the style of the ASE certification tests.
High-voltage safety, battery systems, motors and inverters, charging, regenerative braking and diagnosis for hybrid and EV certification.
| Exam | Electrical / electronic systems (A6) |
|---|---|
| Who runs it | ASE |
| Where | United States |
Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.
Two 6-ohm resistors are connected in series across a 12-volt battery. How much current flows?
C. 1 amp
Series resistances add: 6 + 6 = 12 ohms, and 12 V / 12 ohms = 1 A. The answer 4 A comes from treating the resistors as if they were in parallel (3 ohms).
Reference: Ohm's law; series circuits
How much current does a 60-watt bulb draw on a 12-volt circuit?
A. 5 amps
Power equals volts times amps, so amps = watts / volts = 60 / 12 = 5 A. Dividing the wrong way round gives 0.2, and multiplying gives 720.
Reference: Watt's law (P = E x I)
With the engine at about 2,000 rpm and the accessories off, which voltage at the battery shows normal charging?
B. 14.2 volts
A working charging system holds the battery roughly in the mid-13 to mid-14 volt range. A reading near 12.4 volts or lower means the alternator is not charging, and about 16 volts is overcharging that can damage the battery and electronics.
Reference: Charging system voltage test
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Auto maintenance and light repair (G1) · Engine repair (A1) · Suspension and steering (A4) · Brakes (A5) · Heating and air conditioning (A7) · Engine performance (A8) · Light duty hybrid / electric vehicle specialist (L3) · Medium-heavy truck (T1 to T8) · Diesel mechanic fundamentals