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Electric Power Question & Answers

February 10, 2023 By Wat Electrical

This article lists 100 Electric Power MCQs for engineering students. All the Electric Power Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Electric Power.

The electrical energy transferred through an electrical circuit at a specific rate is referred to as Electric Power. P is the symbol that indicates Electric Power. The SI units are Joule/Second or Watts. Electric generators produce power and it is supplied using batteries.

To homes and businesses, this energy is supplied by the industry of electric power via an Electrical grid. To deliver the power for longer distances transmission lines are utilized. The various applications for this power are light, heat, or motion with higher efficiencies.

Based on power the components present in the electric circuits are classified into two different categories. They are Active and Passive devices. Power sources are considered Active devices whereas loads come under passive ones. An example of an active device is Rechargeable batteries, Electric appliances that consume power are passive device examples.

Electric current flows forcefully from low electric to higher potentials in the active device. Positive in these devices flow from a negative terminal to positive ones and the energy gets converted from potential to chemical or mechanical making them act as a source of power. In passive the flow of current is from high to low potential and the energy gets converted into Kinetic energy in devices.

1). Electrical energy transferred in any electric circuitry at certain rates is __________.?

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2). P is the letter indicates ___________?

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Read More about Electric Power
3). What will be the SI units for power?

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4). What SI units for Electrical energy?

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5). Electric generators produce _________?

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6). How does the electrical energy utilized in factories is measured?

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7). What is the electricity utilized by the 50 W bulb which is placed for 10 hours?


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8). Which is not the electric power unit?

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9). What is the formula of Electric Power?

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10). How much is energy i.e., consumed by an appliance for 1kW 1 hr?

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11). What degrades the Power factor?

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12). What are the various categories of components in electric circuitry?

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13). Electric current flow from low to high potential in ___________?

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14). Electric energy converted to chemical or mechanical energies in ___________?

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15). Electric current flow from high to low potential in ________?

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16). Passive components consume _______ power?

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17). Which law is combined with Joules for resistive type circuits?

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18). What is the formula to calculate power for resistive loads?

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19). What is the energy-storing element in AC circuits?

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20). Electric power coming out from the circuit have __________?

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21). Inductors & capacitors dissipate __________ power?

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22). What are the various types of power?

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23). Electrical energy inside the coil is stored known as _________?

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24). What is the power consumed because of resistive loads?

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25). Which power describes the grid's capability of withstanding power?

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Electric Power MCQs for Exams

26). Apparent power is the product of _____ & _____ in the circuit?

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27). What is the unit of Apparent power?

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28). What are the actual amounts of power dissipated or used in circuits?

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29). Which power is the function of circuit reactances?

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30). What is ‘Phantom Power’?

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31). The symbol Q represents ____________?

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32). What is the unit of Reactive power?

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33). Which letter indicates Apparent power?

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34). Volt-Amps is the unit of _________?

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35). Electrical Power in a circuit is inverse in proportion to ________?

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36). A lamp with the voltage provided as 12 V & current of 4A. What is the power of the lamp?

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37). A generator worth 200 Volts is connected to a bulb with a current of 0.5 Amps. What is the bulb's power?

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38). Work done/Time taken is the formula of __________?

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39). A bulb of 300 Volts with 100 ohms resistance. What is the consumed power?

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40). What is the Power-energy formula?

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41). VQ/t is ___________?

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42). What happens to power in a circuit if the resistance is increased by maintaining the current as constant?

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43). What happens to power for lower resistance by maintaining V as constant?

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44). For constant potential differences the power will be low if resistance is ________?

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45). Electric power is ________?

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46). What is the main classification of Electric power?

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47). Which power is produced by batteries?

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48). In which power there is a periodic alteration in the direction?

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49). What are the various classifications of AC power?

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50). How apparent power is expressed mathematically?

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Electric Power MCQs for Interviews

51). How to represent active power mathematically?

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52). How to represent reactive power mathematically?

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53). Active power gets dissipated in ____________ of the circuit?

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54). How active, apparent & reactive powers are related?

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55). What is the Power factor?

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56). Power factor lies in the range of ________?

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57). Which power is useless in AC circuits?

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58). Which power is induced in any circuit if there is a lagging current behind the voltage applied?

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59). Which power is used to measure the value of the Power factor?

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60). How active power is measured?

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61). How the reactive power is measured?

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62). Heat in the heater is produced due to __________?

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63). Which power performs the work i.e., required in the circuit?

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64). What measures Electric power?

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65). What develops the torque in the motor?

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66). What is the total amount of power is generated in a Parallel connected circuit?

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67). Electric power dissipated in any series of circuits is dependent on ____________?

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68). What happens to power if the electric appliance is serially combined?

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69). What gets dissipated highly in a parallel combination of circuits?

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70). Parallel circuits consume more amount of __________?

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71). Transformer requires __________ for producing a magnetic field?

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72). Which currents are generated by Electric stations of power?

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73). What is the frequency of Electric Power generated at the station?

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74). Electric power generated at the station transmits at __________?

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75). What is the reason for generating power at 11 kV?

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Electric Power MCQs for Students

76). Why is the Electric power transmitted at higher voltages?

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77). What happens to power if the voltage gets doubled?

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78). Electromechanical Generator produces ____________?

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79). Electric Power is produced in generators based on _____________?

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80). What is the importance of Electrochemistry?

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81). What is generated when fresh salt & water are merged?

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82). The chemical energy is converted to ____________ in batteries?

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83). Light is converted into Electric power or energy in ___________?

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84). Heat engines generate ________?

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85). Water gets boiled with coal and produces __________?

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86). For what loads do the Power factor gets lag?

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87). Which loads have a leading Power factor?

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88). What happens to the power factor if voltage & current will be in-phase?

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89). How kVA relates to Power Factor?

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90). How electricity is important for health professionals?

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91). The steam generated by the nuclear reactor produces ____________?

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92). What is the main intention of the Electric Power System?

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93). What is the main aim of Thermal power plants?

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94). Electric power systems that are capable of supplying power to confined region is _____________?

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95). What are the main parts of an Electric Power System?

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96). How the Electric Power System is considered to be important?

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97). What are the stages involved in the supply of Electric Power?

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98). Why turbines are used?

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99). How is the power used for entertainment?

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100). Transmission lines deliver ____________?

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For More MCQs

  • Regulated DC Power Supply Question & Answers.
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