Data Sheet
-34-
37. Toy Lights
Build the circuit shown on the left, press the switch (62) and the bi-
directional LED (71) and star LED (70) will turn on. Press the switch
(62) again and the LEDs will turn off. Circuits like this are used in lots
of battery operated infant toys where lights go ON and OFF as the child
presses the button.
38. Power
Build the circuit shown on the left and the motor (95) will spin while
the lamp (76) is on. Power is dened as voltage times current and
is measured in Watts. If you measured the internal resistance of the
motor (95) and the lamp (76) you would see that they are similar. Since
the motor (95) and lamp (76) are in series in this circuit, they see
the same current. If the internal resistance (R) and current (I) through
each component are the similar, then Ohm’s law (V = I*R) tells us that
the Voltage (V) across each component is similar. This shows that the
power of each component (V*I) is also similar.
WARNING: Moving parts. Do not
touch the motor during operation. Do
not lean over the motor.
!