Geometrical contruction of waves on a electric line with wave impedance Z after switching voltage source in place A - using Bergeron's method. Losses can be set for line using resistor RV. These losses are approximated by lumped element model - half the resistance RV is at start of the line, the other half at the end of the line. Loading resistor at the end of the line (B) can be set from short circuit (closed end R=0 Ohm) up to almost no-load state (open end R=10 kiloOhm).