Electrical Engineering Questions and
Answers | Latest Update | 2024/2025 |
Graded A+
What is Ohm's Law?
Ohm's Law states that the current (I) passing through a conductor between two points is
directly proportional to the voltage (V) across the two points and inversely proportional to th...
✔✔ Ohm's Law states that the current (I) passing through a conductor between two points is
directly proportional to the voltage (V) across the two points and inversely proportional to the
resistance (R). The formula is expressed as V = IR.
What happens to the current in a series circuit if one component fails?
✔✔ In a series circuit, if one component fails, the entire circuit is interrupted, and the current
stops flowing.
Why is a transformer used in electrical circuits?
✔✔ A transformer is used to step up or step down the voltage in electrical circuits, allowing
efficient transmission of electrical energy over long distances by reducing energy losses.
What is the purpose of a capacitor in an AC circuit?
✔✔ In an AC circuit, a capacitor is used to store electrical energy temporarily and to smooth
voltage fluctuations, as well as to phase-shift the current.
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, Explain the difference between a conductor and an insulator.
✔✔ A conductor allows the free flow of electric current due to the availability of free electrons,
whereas an insulator resists the flow of electric current due to the lack of free charge carriers.
What is the function of a diode in a circuit?
✔✔ A diode allows current to flow in one direction only, acting as a rectifier by converting
alternating current (AC) to direct current (DC).
What is a three-phase power system?
✔✔ A three-phase power system is an electrical distribution method that uses three alternating
currents, each set 120 degrees apart in phase, providing a more constant and reliable power
supply compared to single-phase systems.
What is the significance of power factor in electrical systems?
✔✔ Power factor measures the efficiency of power usage in a system. It is the ratio of real power
(used to perform work) to apparent power (total power). A high power factor indicates more
efficient power usage.
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