In a single-phase RL circuit, the RMS voltage across the supply is 100 V, the RMS current is 5 A, and the current lags the voltage by 60°. Determine the apparent power of the circuit.
500 VA
To determine the apparent power in a single-phase RL circuit, we use the formula for apparent power S given by:
S = V \times I
where:
- V is the RMS voltage across the supply.
- I is the RMS current flowing through the circuit.
From the question, we are given:
- RMS voltage, V = 100 \, \text{V}
- RMS current, I = 5 \, \text{A}
- The phase angle by which the current lags the voltage is 60^\circ. This is relevant for calculating real power but not directly needed for apparent power.
Substituting the given values into the formula for apparent power, we get:
S = 100 \, \text{V} \times 5 \, \text{A}
Thus:
S = 500 \, \text{VA}
Therefore, the apparent power of the circuit is 500 VA.
The correct answer is 500 VA.
Similar Questions
A 12μF capacitor and a 4μF capacitor are connected in series. The ratio of voltages across them will be:
Which combination of the following statements about direct resistance heating are correct?
i) The process requires the charge to be electrically conductive.
ii) Electrodes are placed in direct contact with the charge.
iii) Heat is generated by induced eddy currents in the charge.
iv) The charge does not form part of the electric circuit.
Select the option that is correct regarding the following two statements labelled Assertion (A) and Reason (R).
Assertion (A): Three-phase auto-transformers are smaller and lighter than equivalent three-phase two-winding transformers.
Reason (R): Auto-transformers use fewer windings and a smaller core.
The fundamental operating principle of a transformer is based on:
Important Questions from Transformer
Which of the following is used in transformer protection system?
Open circuit test on transformers is conducted to determine which of the following?
________ is a property of ferromagnetic materials that causes them to change their shape or dimensions during the process of magnetization.
The transformation ratio ($K$) of a step-up transformer is:
A transformer transforms
