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 Measurement of Power & Energy 30 Flashcards |
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What is the formula for calculating electric power in a DC circuit? |
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P = V × I |
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Fill in the blank: The average power in a single-phase AC circuit is defined as the product of the ______ and ______ values of voltage and current. |
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Effective (R.M.S.), effective (R.M.S.) |
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True or False: In a balanced three-phase circuit, the line voltages are equal. |
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True |
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Riddle: I measure the energy consumed, turning action into digits, my face may be analog or digital. What am I? |
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Energy meter |
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What method is used to determine the time difference between voltage and current in an AC system? |
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Zero cross detection |
Card: 10 / 30 |
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Which of the following formulas represents instantaneous power in an AC circuit? A) P = VI B) P(t) = v(t)i(t) C) P = V²/R D) P = I²R |
Card: 11 / 30 |
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B) P(t) = v(t)i(t) |
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Fill in the blank: The total power in a balanced three-phase system can be calculated using the formula ______. |
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PT = VL IL cosΦ |
Card: 14 / 30 |
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True or False: The reactive power in an AC circuit is the total power consumed by the load. |
Card: 15 / 30 |
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False. Reactive power is the power that oscillates between the source and the load, not consumed. |
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What type of energy meter is characterized by a rotating aluminum disc and is commonly used? |
Card: 17 / 30 |
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Electro-Mechanical induction type Energy meter |
Card: 18 / 30 |
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Riddle: I’m a measure of the angle between voltage and current, expressed as the cosine of that angle. What am I? |
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Power Factor |
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What is the SI unit of energy, heat, and work? |
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Joule (J) |
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Fill in the blank: The formula to calculate energy consumed by a load is [number of hours’ use] x [number of days’ use] x ([capacity of appliance expressed in watt] / ______) = number of kWh. |
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1,000 |
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True or False: Smart energy meters can only communicate data in one direction. |
Card: 25 / 30 |
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False. Smart energy meters can communicate in both directions. |
Card: 26 / 30 |
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What is the relationship between Total Harmonic Distortion and the distortion factor in non-sinusoidal currents? |
Card: 27 / 30 |
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The relationship can be derived from specific expressions related to power factor. |
Card: 28 / 30 |
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Which type of energy meter measures power instantaneously and is preferred for its accuracy? |
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Electronic Energy Meters |
Card: 30 / 30 |
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Completed! Keep practicing to master all of them. |
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