-25-
19. Lamp, LED, and Motor Series
Connection
In this series connection, you will find that
the LED (69) will light and the motor will
spin, but the lamp is off. If the motor does
not spin you may need to get it started by
spinning the shaft with your finger. The
lamp is off because the voltage drop across
the LED and motor (at least 1.5 volts)
reduces the voltage across the lamp (76),
thus limiting the current through the lamp
(76) preventing it from lighting.
20. Switch-controlled Lamp, LED
& Motor Series/Parallel
Connection (I)
Build the circuit, you will find that the
motor (95) spins, the LED (69) lights, and
the lamp (76) lights dimly. The lamp (76)
is dim because it is connected with the
LED (69) in a series circuit, and thus the
voltage drop across the LED (at least 1.5
volts) limits the current through the lamp
(76), too low to light up the lamp (76).
2nd level
2nd level
E-BLOX_2X_Model_115_042517 5/17/2017 10:58 AM Page 26
