11.- Magnet-controlled LED
Place a magnet close to the
switch 13, the LED 17 will
light up, keep the magnet
away and the LED 17 will
power off.
12.- LED and electric fan connected in series
Close the switch 15, the LED 17 will light up, but the motor 24 won't spin
round, this is due to the motor requires a bigger quantity of energy and it
is consumed by the LED.
ENGLISH-13