Tagalog: draft — for Kate / Janet to check. Shown in slow motion: in a real circuit this all happens in thousandths of a second.
Mabagal magsimula, ayaw tumigil. Slow to get going, refuses to stop. Lamp in parallel: flashes on at switch-on and again at switch-off.
Kuryente sa wire = magnetic field. Mas maraming ikot ng coil = mas malakas. Current makes a magnetic field; coiling the wire adds the fields together. The field stores the energy.
Resistor: biglang tumataas at bumababa ang kuryente. Inductor: dahan-dahan (back EMF). Resistor: current jumps instantly. Inductor: it curves up and curves down.
Ang motor ay inductor. Kapag pinatay, may malaking spike na pumapatay sa MOSFET. Ang flyback diode ang sumasalo. A motor is an inductor. Switch it off and it throws a big voltage spike that kills the MOSFET. The flyback diode catches it.
Motor, transformer, buck/boost converter, filter, choke. Sukat: henry (H). Measured in henries (H). A normal multimeter can't measure it; an LCR meter can.