A) i. Represent the waveform of the voltage across the load U(t), the diode UD(t), and the chopper UH(t).

2. a) i. Represent the waveform of the voltage across the load $U(t)$, the diode $U_D(t)$, and the chopper $U_H(t)$.

• When switch H is closed ($0 \le t \le T_{ON}$):

  • The supply voltage $U_S$ is applied across the motor (load). $U(t) = U_S$.
  • The diode D is reverse biased, so $U_D(t) = -U_S$.
  • The voltage across the closed switch H is $U_H(t) = 0$.

• **When switch H is open ($T_{ON} < t \le T$):