If the peak value of current and voltage are doubled then percentage change in <p>?
Correct answer: A. 300%
- A. 300%
- B. 200%
- C. 100%
- D. none
Explanation
In an electrical circuit, the power (P) is given by the formula P = Vpeak * Ipeak, where Vpeak is the peak voltage and Ipeak is the peak current. If both the peak voltage and peak current are doubled, the new power becomes (2Vpeak)*(2Ipeak) = 4Vpeak*Ipeak. This results in a fourfold increase in power, which translates to a 300% increase (since the original power was 100%, and now it is 400%). Therefore, the correct answer is Option A, which reflects a 300% increase in power. Other options do not correctly capture this exponential power increase.
Last updated
About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
Practise Alternating Current
592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
220V, 50 Hz AC supply is connected across a resistor of 50 k ohms. The current at time t Seconds, assuming that it is zero at t = O, is?
220V, 50 Hz AC supply is connected across a resistor of 50 k ohms. The current at time t Seconds, assuming that it is zero at t = O, is?
A 10 Ω resistor and a 40 μF capacitor are connected in parallel to a 110 V, 50 Hz AC supply. The total current is:
A 100 μF capacitor is connected to a 120 V (rms) AC source at 50 Hz. What is the rms current in the circuit?
A 100 μf capacitor will offer a reactance of: