I took the new Fundamentals Cert exam tonight.
Arduino Fundamentals is an online exam that provides official certification
If anyone (OP?) has the kit's booklet, I'm keen to see that circuit.
In the circuit shown in Fig. 5, you're supplying 5 volts. The resistor offers 220 ohmsresistance. To find the amperage used by the LED, replace the values in the equation.You should have 5=I*220
The most obvious one is on page 30, where Ohms law is misused. They totally neglect the voltage-drop over the LED, which at this voltage levels is a big error. The calculations are thus wrong, and the conclusions in error.