Electrical Engineering 面试题与答案
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问题 1. What is Ohm's Law?
Ohm's Law states that the current passing through a conductor is directly proportional to the voltage across its ends, provided the temperature remains constant.
Example:
I = V/R, where I is current, V is voltage, and R is resistance.
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问题 2. Explain the difference between AC and DC.
AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction consistently.
Example:
Household electrical outlets provide AC, while batteries provide DC.
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问题 3. What is the purpose of a transformer?
A transformer is used to change the voltage of an alternating current, either increasing (step-up) or decreasing (step-down) the voltage.
Example:
Power distribution often involves step-up and step-down transformers.
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问题 4. Define the term 'Power Factor'.
Power Factor is the ratio of real power to apparent power in an AC circuit, representing the efficiency of power usage.
Example:
A power factor of 1 indicates perfect efficiency, while lower values imply inefficiency.
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问题 5. What is the skin effect in electrical conductors?
The skin effect is the tendency of alternating current to concentrate on the outer surface of a conductor, reducing its effective cross-sectional area.
Example:
It becomes more significant at higher frequencies.
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用户评价最有帮助的内容：
- What is Ohm's Law?
- Define the term 'Grounding' in electrical systems.
- Explain the concept of electric potential.
- What is the role of a voltage regulator in electronic devices?
- Explain the difference between AC and DC.