cameroon gce advanced level 2025 electrical and electronic circuit 3

Topic 1: Study the characteristics of a sinusoidal wave.

• a) Determine:
  • i. The value of the voltage VCmax​ and that of the current ICmax​.
  • ii. The period T and the frequency F of the signal.
  • iii. The average and effective value of the voltage VC​(t) in one period.
  • iv. The average and effective value of the current IC​(t) in one period.
  • v. The Period of the signal knowing that the time base setting is 3.33ms/div.
• b) Consider the quantity u(t)=2202​sin(314t+π). Determine:
  • i. The phase angle.
  • ii. The effective and maximum values.
  • iii. The instantaneous value at time t = 5ms.
  • iv. Represent u(t).

Topic 2: Is to control 3 lamps

• a) With the help of Karnaugh map determine the simplified equations of L1, L2 and L3.
• b) Draw the simplified equation of L1, L2 and L3 using only NAND gate with two inputs.
• c) Use the integrated circuit in figure 2 and realise the connection of the system.