4. In the circuit below, the voltage Ved(t) = 25 cos(377t + 45°) V. i(t) Vo(t) 10k2 0.2uF d. a) Find the admittance of the circuit. b) Draw a phasor diagram showing the current in each element, the voltage Ved, and the phasor current I corresponding to i(t).

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**Problem Statement:**

4. In the circuit below, the voltage \( V_{cd}(t) = 25 \cos(377t + 45^\circ) \) V.

**Circuit Description:**

- The circuit consists of a resistor and a capacitor in series.
- The resistor has a resistance of \(10 \, \text{k}\Omega\).
- The capacitor has a capacitance of \(0.2 \, \mu\text{F}\).
- The voltage source \( V_{cd}(t) \) is applied across points \( c \) and \( d \).
- The current flowing through the circuit is denoted as \( i(t) \).

**Tasks:**

a) Find the admittance of the circuit.

b) Draw a phasor diagram showing the current in each element, the voltage \( V_{cd} \), and the phasor current \( I \) corresponding to \( i(t) \).
Transcribed Image Text:**Problem Statement:** 4. In the circuit below, the voltage \( V_{cd}(t) = 25 \cos(377t + 45^\circ) \) V. **Circuit Description:** - The circuit consists of a resistor and a capacitor in series. - The resistor has a resistance of \(10 \, \text{k}\Omega\). - The capacitor has a capacitance of \(0.2 \, \mu\text{F}\). - The voltage source \( V_{cd}(t) \) is applied across points \( c \) and \( d \). - The current flowing through the circuit is denoted as \( i(t) \). **Tasks:** a) Find the admittance of the circuit. b) Draw a phasor diagram showing the current in each element, the voltage \( V_{cd} \), and the phasor current \( I \) corresponding to \( i(t) \).
**Formulas:**

- \(\omega = 2 \times \pi \times f\)
- \(A \cos(\omega t + \theta) \rightarrow A \angle \theta\)
- \(V = I \times Z\)

- **Polar to rectangular:**

  - Polar: \(R \angle \theta\)
  - \(a = R \times \sin \theta\)
  - \(b = R \times \cos \theta\)

  **Rectangular: \(a + jb\)**

- **Rectangular to polar:**

  - Rectangular: \(a + jb\)

  - \(R = \sqrt{a^2 + b^2}\)
  - \(\theta = \tan^{-1}\frac{b}{a}\)

  **Polar: \(R \angle \theta\)**

---

**Component Table:**

| Component | Value | Reactance (X) | Impedance Z (Rectangular) | Impedance Z (Polar) |
|-----------|-------|---------------|---------------------------|---------------------|
| Resistor  | \(R\) | \(R\)         | \(R + 0j\)                | \(R \angle 0\)      |
| Capacitor | \(C\) | \(1/\omega C\) or \(1/2\pi f C\) | \(1/j\omega C\) or \(-j/\omega C\) | \(1/\omega C \angle -90^\circ\) |
| Inductor  | \(L\) | \(\omega L\) or \(2\pi f L\) | \(j\omega L\)         | \(\omega L \angle 90^\circ\)  |

---

- **Admittance \(Y = \frac{1}{\text{Impedance } Z}\)**

- Always draw impedance phasors with reference as resistor impedance. For example, if you have a 200 ohm resistor, an inductor with impedance of 100 ohms, and capacitor with impedance of 1000 ohms:

  - Phasor diagram explanation:
    - The vector on the right represents a resistor with an impedance of \(200 \angle 0^\circ\).
    - The upward vector represents an inductor with an impedance of \(100 \angle 90^\circ\).
    - The downward
Transcribed Image Text:**Formulas:** - \(\omega = 2 \times \pi \times f\) - \(A \cos(\omega t + \theta) \rightarrow A \angle \theta\) - \(V = I \times Z\) - **Polar to rectangular:** - Polar: \(R \angle \theta\) - \(a = R \times \sin \theta\) - \(b = R \times \cos \theta\) **Rectangular: \(a + jb\)** - **Rectangular to polar:** - Rectangular: \(a + jb\) - \(R = \sqrt{a^2 + b^2}\) - \(\theta = \tan^{-1}\frac{b}{a}\) **Polar: \(R \angle \theta\)** --- **Component Table:** | Component | Value | Reactance (X) | Impedance Z (Rectangular) | Impedance Z (Polar) | |-----------|-------|---------------|---------------------------|---------------------| | Resistor | \(R\) | \(R\) | \(R + 0j\) | \(R \angle 0\) | | Capacitor | \(C\) | \(1/\omega C\) or \(1/2\pi f C\) | \(1/j\omega C\) or \(-j/\omega C\) | \(1/\omega C \angle -90^\circ\) | | Inductor | \(L\) | \(\omega L\) or \(2\pi f L\) | \(j\omega L\) | \(\omega L \angle 90^\circ\) | --- - **Admittance \(Y = \frac{1}{\text{Impedance } Z}\)** - Always draw impedance phasors with reference as resistor impedance. For example, if you have a 200 ohm resistor, an inductor with impedance of 100 ohms, and capacitor with impedance of 1000 ohms: - Phasor diagram explanation: - The vector on the right represents a resistor with an impedance of \(200 \angle 0^\circ\). - The upward vector represents an inductor with an impedance of \(100 \angle 90^\circ\). - The downward
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