Alternating Current Circuits
Physics ⇒ Electricity and Magnetism
Alternating Current Circuits starts at 11 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Alternating Current Circuits.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 11
A 100 V, 60 Hz AC supply is connected to a 0.5 μF capacitor. Calculate the capacitive reactance.
A 200 Ω resistor is connected to a 100 V, 50 Hz AC supply. Calculate the rms current through the resistor.
A 50 Hz AC voltage has a peak value of 325 V. What is its rms value?
A 60 W, 120 V lamp is to be used on a 240 V, 50 Hz AC supply. What value of non-inductive resistance should be connected in series with the lamp?
Calculate the rms value of an alternating current whose peak value is 10 A.
Define the term 'impedance' in an AC circuit.
Describe the effect of increasing the resistance in a series RLC circuit on the sharpness of resonance.
Explain why alternating current is preferred over direct current for long-distance power transmission.
Explain why the power factor is important in AC circuits.
If the frequency of the AC supply is doubled, what happens to the capacitive reactance?
If the rms value of an AC voltage is 220 V, what is its peak value?
State one application of resonance in AC circuits.
State the phase relationship between current and voltage in a purely inductive AC circuit.
What is the main function of a transformer in an AC circuit?
What is the unit of reactance?
A 60 W, 120 V lamp is to be operated on a 240 V, 50 Hz AC supply using a capacitor in series. What should be the value of the capacitor?
A series RLC circuit has R = 50 Ω, L = 0.1 H, and C = 100 μF. If the applied AC voltage is 120 V at 60 Hz, calculate the phase angle between the current and the voltage.
A series RLC circuit resonates at a frequency of 1 kHz. If the inductance is 0.2 H, calculate the required capacitance for resonance.
A transformer has 500 turns in the primary coil and 100 turns in the secondary coil. If the input voltage is 220 V AC, what is the output voltage?
If the power factor of an AC circuit is 0.6 and the apparent power is 500 VA, what is the true power consumed by the circuit?
