Teaching kids
robotics & electronics
with hands-on project kits + online lessons

Create an account to learn with our FREE online lessons and
preview our project curriculum:

* We will never ever ever share your email address

What EEME kids said they learned in Sep 2016

Winner of Editor's Choice
Top Pick for Kids
About the NPN Circuit Pt 2
the resistor connects to the base wire and it turns gives power to the positive and negative wires and they connect to the positive and negative wires of the buzzer
How does the photoresistor control the transistor?
When there is light there is less resistance so it speeds up the motor. When there is no light there's more resistance to the transistor breaking the circuit and turning the motor off.
About the Pushbutton LED Circuit
when the pushbutton is open, the circut is open and cant flow but when the pushbutton is closed, it can flow through and light up the LED
How does the LED work?
The LED works by putting the short end connecting to the negative side of the battery pack, and the long end connecting to the positive side of the battery pack, which powers the light.
Sharing Current Explained
all the currents are divided into different LEDs then if you unplug one of the bottom wires it will turn off the ugly LED segments but you plug it in it will turn them back on
About the PNP Transistor
the PNP transistor works by turning the buzzer off when there is positive voltage going to the middle pin (base) of the transistor. and when you don't apply positive voltage to the base pin, the buzzer will buzz.
Create an account to learn
with our free online lessons