It seems you've uploaded an image related to an electrical circuit exercise, specifically on alternate waves and oscilloscopes. Let me assist you by addressing the calculations and steps mentioned.

Breakdown of Tasks from the Image:

1. Inscrire les valeurs nominales des résistances R1, R2, R3, R4, R5 et R6 (Provide nominal resistance values):

   • This requires input of the specific resistance values for the components from the diagram (not visible in this extract).

2. Calculer $R_T$ (Calculate total resistance):

   • Total resistance $R_T = 730 \, \Omega$ is already calculated and noted.

3. Calculer $E_{\text{eff}}$ et $I_{\text{eff}}$ (Calculate $E_{\text{eff}}$ and $I_{\text{eff}}$):

   • $E_{\text{eff}} = \frac{16}{\sqrt{2}} = 11.31 \, \text{V}$ (assuming the 16 V is the peak voltage for a sinusoidal waveform).
   • $I_{\text{eff}} = \frac{E_{\text{eff}}}{R_T} = \frac{11.31}{730} = 0.0155 \, \text{A} \, \text{(15.5 mA)}$.

4. Calculez les valeurs efficaces suivantes (Calculate the effective values of currents and voltages):

   • You need the circuit diagram to know how the resistors are connected (series/parallel). If you provide more information or resistance values, I can compute each $IR1, IR2, \dots, VR1, VR2, \dots$.

What’s Next?

If you’d like to proceed, please share:

• Resistance values for $R1, R2, \dots, R6$.
• Circuit configuration (series/parallel).

Would you like to calculate detailed effective values or need any clarifications?

Related Questions:

1. How are $R1, R2, \dots, R6$ connected in the circuit?
2. What is the peak voltage source type (sinusoidal, square)?
3. Is there additional information about phase shifts or reactive components?
4. Are there any reactive components (inductors or capacitors) involved in the circuit?
5. Would you like a formula explanation for effective voltage and current?

Tip: For AC circuits, always confirm whether the provided voltage is peak or RMS to avoid calculation errors!