Watch the video below for step-by-step instruction to assemble your Magic Lantern!
So….Why are they called Magic Lanterns?
Do you want to know? Let’s check it out together. First….please follows the step-by-step instruction in the video above to assemble your lantern.
So is anything happening with your lantern? Are the tiny light bulbs in your lantern lighting up? NO???
Now try going into a DARK room. It should magically light up…Yayyy!
That’s really COOL….
Do you want to know how it works? Let’s explore it together 🙂
Do you remember the electric components in your kit? You had a Battery and two LEDs (or tiny light bulbs). Battery gives energy to the tiny light bulbs so that they have power to light up.
You also have a component that looks like a cable that’s sticking out from the lantern. Now, this part is called a PHOTORESISTOR. It’s a smart sensor that can detect how much light is present in the room. So when there’s a lot of light in the room, it will tell the light bulbs that they can go to sleep, so the light is off. But when the room is dark, for example at night, the sensor will tell the light bulbs to wake up and turn their lights on. Pretty cool, huh? 🙂
Photoresistor is a very useful component in electronic circuit. Can you think of other cool projects that can use this smart sensor?
Do you know how the streetlights turn on automatically when it starts turning dark?
There are two ways in which streetlights can work. It depends on what mechanism is actually implemented on the streetlights.
Some countries use timers to control the streetlights, while some others use photodetectors to control them.
Timer controlled street lamps usually use an electronic clock that is built into the entire system. The clock turns the street lights on in the evening and off in the morning automatically depending on the timer settings. Some systems have a slightly different timer that varies slightly day by day thereby keeping the lights on for longer periods in the winter months and for shorter periods in the summer.
Modern street lights use photodetectors that turn the lights on, when the amount of light falls below a particular threshold. Thus energy is saved by ensuring the light is only on during hours of darkness.