Data Sheet
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84. LED Efciency
Build the circuit shown on the left, then turn on the switch (62). If you
touch the reed switch (83) or press the press switch (61), you will then
light up the two LEDs at the same time. If you want to turn off the two
LEDs, you can turn off the press switch (61) and the reed switch (83)
or turn off the switch (62).
An incandescent lamp converts about 9-10% of the energy fed to it into
light, whereas LEDs convert at least 50% of that incoming energy they
consume to light, the rest being lost to heat generation. So LEDs are
much more efcient than incandescent lamps.
85. Instant ON
Build the circuit shown on the left and you will see the heart LED (69)
is on. Turn on the switch (62) and place the magnet (7) near the reed
switch (83). Now when you press the press switch (61) the star LED
(70) comes on.
Due to the physics involved, LEDs have what we call Instant ON —
unlike their incandescent counterparts. What this means is that you
can switch an LED lamp on and you get the full brightness of that light
instantly.
1st level
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