Basic Electricity Practice Exam
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About this Exam
Prepare with the Basic Electricity Practice Exam practice quiz. This question bank includes 10 questions covering circuit, current, voltage, resistance, and total. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.
Sample Questions
Question
1
What term describes a circuit in which electrons can flow from the power source to the load and back?
Explanation:
Current can flow only when there is a closed path for the charges to travel. A complete circuit provides a continuous loop from the power source, through the load, and back to the source, so electrons can leave the source, pass through the load, and return, delivering power in the process. If the loop is broken, no current flows, which is what an open circuit describes. A short circuit is a closed path with very low resistance that bypasses the load, so while current can flow, it doesn’t go through the intended device. An isolated circuit isn’t connected to a power source or load, so no current flows either. Therefore, the term that best fits electrons flowing from the power source to the load and back is a complete circuit.
Question
2
In an AC circuit, the current or voltage values are typically specified as which type of value?
Explanation:
AC voltages and currents vary with time, so we use a single number that reflects the actual power they can deliver. That number is the RMS (root-mean-square) or effective value. It’s defined so that the power in a resistor with AC voltage equals the same as with a steady DC voltage of the same magnitude, i.e., P = V_rms^2 / R = I_rms^2 R. For a sinusoidal signal, V_rms is the peak voltage divided by sqrt(2); the same relation holds for current. If we used peak values, power ratings wouldn’t have a consistent basis; the average value over a full cycle for a sine wave is zero, which isn’t useful for power. Instantaneous values describe the exact momentary reading, but ratings and comparisons require a stable measure, hence RMS. Devices and systems are thus specified by effective (RMS) values.
Question
3
The control valve switch must be placed in the neutral position when the landing gears are down to ________.
Explanation:
When the landing gear are down, the warning horn system is designed to stay quiet unless there’s a true fault. Placing the control valve switch in the neutral position isolates the throttle-position input from the horn circuit, so closing the throttles won’t trigger the horn. This keeps the cockpit from hearing a nuisance warning during approach or after landing when gear are down. Therefore, the correct outcome is to prevent the warning horn from sounding when the throttles are closed. The other options would either imply delaying or triggering the horn, or having no effect, which doesn’t align with how the interlock is intended to work.
Question
4
A 5-band resistor has bands Brown, Black, Black, Red, Gold. What is its resistance and tolerance?
Explanation:
Reading a 5-band resistor involves three significant digits, a multiplier, and a tolerance. Brown, Black, Black give 1-0-0, so the digits are 100. The multiplier band is red, which represents 10^2 (100), so 100 × 100 = 10,000 ohms. The final band is gold, meaning a tolerance of ±5%. So the resistor is 10 kΩ with ±5% tolerance.
Question
5
In a parallel lighting circuit, if one of the three bulbs is removed, what happens to the total resistance?
Explanation:
In a parallel circuit, the total resistance depends on how many separate paths for current exist. Each extra path lowers the overall resistance because current has more routes to flow through. For three identical bulbs in parallel, the combined resistance is one-third of a single bulb’s resistance. If one bulb is removed, only two paths remain, so the total resistance becomes one-half of a single bulb’s resistance, which is higher than the three-path case. So the total resistance increases. It wouldn’t decrease, stay the same, or become zero as long as at least one path remains.
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Basic Electricity Practice Exam
This practice set contains 10 questions from the matching question bank and focuses on circuit, current, voltage, resistance, and total. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.
This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.
Frequently Asked Questions
This quiz contains a total of 10 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.
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