Class 12 Exam  >  Class 12 Questions  >  Power in an ac circuit is equal toa)Instantan... Start Learning for Free
Power in an ac circuit is equal to
  • a)
    Instantaneous voltage X Instantaneous current
  • b)
    Instantaneous voltage X current at an instant
  • c)
    Voltage at an instant X Instantaneous current
  • d)
    Both b and c
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Power in an ac circuit is equal toa)Instantaneous voltage X Instantane...
Explanation:

Power in an AC circuit is equal to Instantaneous voltage X Instantaneous current:

- In an AC circuit, both voltage and current vary with time, and power is the rate at which work is done or energy is transferred.
- Power in an AC circuit is given by the product of the instantaneous voltage and the instantaneous current at any given moment.
- This means that at any instant, the power being dissipated or consumed in the circuit can be calculated by multiplying the instantaneous voltage and current values at that particular moment.
- Mathematically, the formula for power in an AC circuit is P = V(t) * I(t), where P is power, V(t) is the instantaneous voltage, and I(t) is the instantaneous current at a given time t.
- Therefore, the correct answer is A: Instantaneous voltage X Instantaneous current.
View all questions of this test
Most Upvoted Answer
Power in an ac circuit is equal toa)Instantaneous voltage X Instantane...
As in DC circuits, the instantaneous electric power in an AC circuit is given by P=VI where V and I are the instantaneous voltage and instantaneous current respectively.
Free Test
Community Answer
Power in an ac circuit is equal toa)Instantaneous voltage X Instantane...
But current at an instant and voltage instant can be said as instantaneous current and voltage nah ?
Explore Courses for Class 12 exam

Similar Class 12 Doubts

Read the following text and answer the following questions on the basis of the same:Shunt resistance: The ammeter shunt is the device which provides the low resistance path to the flow of current. It is connected in parallel with the ammeter. In some ammeter the shunt is in-built inside the instrument while in others it is externally connected to the circuit. Ammeters are designed for measurement of low current. For measuring high current, the shunt is connected in parallel to the ammeter. The significant portion of the current passes to the shunt because of the low resistance path and little amount of current passes through the ammeter. The shunt is connected in parallel to the ammeter because of which the voltage drops across the meter and shunt remain the same. Thus, the movement of the pointer is not affected by the shunt. Let us consider that the current to be measured is I. The circuit has ammeter and shunt connected parallel to each other. The ammeter is designed for measurement of small current say, Im. The magnitude of the current I passes through the meter is very high, and it will burn the meter. So, for measuring the current I the shunt is required in the circuit. As the shunt connects in parallel with the ammeter, thus the same voltage drops occur between them:IShRSH = ImRm∴ RSH = ImRm/ISHShunt current ISH = I – ImSo, RSH = ImRm/(I – Im)∴ I/Im = 1 + (Rm/RSH)The ratio of the total current to the current required for the movement of the ammeter coil is called the multiplying power of the shunt.∴ The multiplying power = m = I/ImRSH = Rm / (m – 1)The following are the requirements of the shunt.• The resistance of the shunt should remain constant with time.• The temperature of the material should remain the same even though substantial current flows through the circuit.Manganin and Constantan are used for making the shunt of DC and AC ammeter respectively. What is multiplying power of the shunt?

Read the following text and answer the following questions on the basis of the same: Roget’s spiral: Magnetic effects are generally smaller than electric effects. As a consequence, the force between currents is rather small, because of the smallness of the factor μ. Hence, it is difficult to demonstrate attraction or repulsion between currents. Thus, for 5 A current in each wire at a separation of 1 cm, the force per metre would be 5 × 10–4 N, which is about 50 mg weight. It would be like pulling a wire by a string going over a pulley to which a 50 mg weight is attached. The displacement of the wire would be quite unnoticeable. With the use of a soft spring, we can increase the effective length of the parallel current and by using mercury, we can make the displacement of even a few mm observable very dramatically. You will also need a constant-current supply giving a constant current of about 5 A. Take a soft spring whose natural period of oscillations is about 0.5–1 s. Hang it vertically and attach a pointed tip to its lower end, as shown in the figure here. Take some mercury in a dish and adjust the spring such that the tip is just above the mercury surface. Take the DC current source, connect one of its terminals to the upper end of the spring and dip the other terminal in mercury. If the tip of the spring touches mercury, the circuit is completed through mercury. Let the DC source be put off to begin with. Let the tip be adjusted so that it just touches the mercury surface. Switch on the constant current supply and watch the fascinating outcome. The spring shrinks with a jerk, the tip comes out of mercury (just by a mm or so), the circuit is broken, the current stops, the spring relaxes and tries to come back to its original position, the tip again touches mercury establishing a current in the circuit and the cycle continues with tick, tick, tick,...What are the main 3 components in a Roget’s spiral?

Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer?
Question Description
Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Power in an ac circuit is equal toa)Instantaneous voltage X Instantaneous currentb)Instantaneous voltage X current at an instantc)Voltage at an instant X Instantaneous currentd)Both b and cCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 12 tests.
Explore Courses for Class 12 exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev