Part a) The components of the circuit of figure 5 are: Rpot = 3.3 k, C = 0.1 , diac ST2 (VBO = 32V). The supply voltage is 120V, 60Hz. C

Here is the complete solution for the practical problem:

Part a) The components of the circuit of figure 5 are: $R_{pot} = 3.3 \text{ k}\Omega$, $C = 0.1 \mu\text{F}$, diac ST2 ($V_{BO} = 32\text{V}$). The supply voltage is $120\text{V}$, $60\text{Hz}$. Calculate:

• i) The time of firing and the period of conduction of the triac when the potentiometer R, is varied to $130 \Omega$.

Step 1: Calculate the peak supply voltage ($V_m$) and the total resistance ($R_{total}$).
The RMS supply