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Questions and Answers
What is the current in the circuit if the voltage is 230 V and the resistance is 40 Ω?
What is the current in the circuit if the voltage is 230 V and the resistance is 40 Ω?
- 7.75 A
- 5.75 A (correct)
- 8.25 A
- 6.25 A
What is the phase angle in this AC circuit?
What is the phase angle in this AC circuit?
- 60 degrees (correct)
- 30 degrees
- 0 degrees
- 45 degrees
How many degrees does the current lag behind the voltage in this circuit?
How many degrees does the current lag behind the voltage in this circuit?
- 90 degrees
- 60 degrees (correct)
- 30 degrees
- 120 degrees
What is the power factor of the circuit?
What is the power factor of the circuit?
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What is the impedance of the circuit?
What is the impedance of the circuit?
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Study Notes
AC Circuit Analysis
- The circuit consists of a 40 Ω resistor, a capacitor, and a 230 V AC voltage source with a frequency of 50 Hz.
- The components are connected in series.
- The current in the circuit is referred to as the phase current.
- The phase current lags behind the voltage due to the presence of the capacitor.
- The impedance of the circuit is the total opposition to current flow.
- The power consumed by the system is the real power dissipated by the resistor.
- The power factor represents the efficiency of power transfer.
- The voltage across the resistor, capacitor, and the combination can be calculated using the impedance and current.
- A phasor diagram helps to visualize the relationships between voltage, current, and impedance in the circuit.
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