Behavior of AC Supply in a Resistive Circuit
Introduction
- AC Supply and Resistive Circuit: The behavior of voltage, current, and power in a resistive circuit when AC supply is applied.
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Basics of Resistance
- Resistance: Opposes the flow of electrons regardless of the current magnitude (e.g., 5A, 15A, or 500A) or type (alternating or constant).
- Ohm’s Law: Voltage (V) is directly proportional to current (I) if resistance (R) is constant.
- Formula: V = I * R
- If resistance is constant, when current increases, voltage increases and vice versa.
Voltage and Current Waveforms in Resistive Circuit
- **AC Waveforms: **Both voltage and current are alternating in nature.
- In-Phase Relationship: Voltage and Current reach their positive peak, zero points, and negative peak at the same time.
- **Waveform Plot: **Voltage and current waveforms are perfectly in phase.
- When current is maximum, voltage is maximum, and vice versa.
Power in Resistive Circuits
- **Instantaneous Power: **Power at a specific instance, calculated by multiplying voltage and current at that instance.
- Formula: P = V * I
- Always positive because the product of two positives or two negatives is positive.
- **Waveform of Power: **Always positive, never goes negative. Drops to zero but rebounds to the positive side.
- **Active Power: **Power that remains always positive. This is the nature of power in resistive circuits.
Key Points to Remember
- **Voltage and Current In-Phase: **They reach their positive peak, zero, and negative peak simultaneously.
- **Power Always Positive: **In resistive circuits under AC supply, power remains always positive.
Additional Resources
- Further Learning: Dedicated video on active, reactive, and apparent power linked in the description of the video.
Conclusion
- Useful Insights: Understanding of how voltage, current, and power behave in a resistive AC circuit.
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