Objective

The purpose of this experiment is to explore the behavior of film capacitors in AC circuits. We will investigate how film capacitors affect voltage and current in an AC circuit.

Components Required

• 1 x Film Capacitor (1µF, 250V)
• 1 x AC Power Supply (AC voltage source, 50Hz)
• 1 x Resistor (1kΩ)
• 1 x Oscilloscope
• 1 x Multimeter
• Connecting Wires
• Breadboard (optional)

Theory

Film capacitors are widely used in AC applications due to their stability and low loss characteristics. They can block DC while allowing AC signals to pass, thus filtering or coupling AC signals in circuits. The capacitor's reactance decreases as frequency increases, affecting the overall impedance of the circuit.

Circuit Diagram

Experimental Setup

1. Connect the AC power supply in series with the resistor and the film capacitor.

2. Connect the oscilloscope probes across the capacitor to observe the voltage across it.

3. Ensure proper grounding and safety precautions while working with AC voltages.

Procedure

1. Set up the circuit according to the diagram, ensuring correct connections.
2. Turn on the AC power supply and set it to a safe voltage level.
3. Use the oscilloscope to measure and record the voltage across the film capacitor.
4. Measure the current flowing through the circuit using the multimeter.
5. Change the frequency of the AC supply and repeat the measurements.
6. Observe how the voltage and current readings change with different frequencies.

Results and Observations

Record the voltage and current readings at different frequencies. Analyze how the film capacitor's behavior changes in response to varying frequencies in the AC circuit.

Conclusion

This experiment demonstrates the role of film capacitors in AC circuits. By observing their behavior at different frequencies, we understand how film capacitors can filter and couple AC signals, making them essential components in various electronic applications.