General Level 2
Electronics Kit
This is how you connect the variable resistor to control the
brightness of an LED.
Variable resistors are sometimes called potentiometers.
Like all resistors they are used to reduce the flow of electrons in a circuit.
Parts:
1 breadboard
1 breadboard power line
AA battery holder
battery connector with 68 OHM resistor
(The 68 OHM resistor reduces current flow)
2 LEDs, (Light Emitting Diode)
(remember that LEDs have a "+" side and a "-" side)
Resistors:
1000 OHM (brown, black, red, gold)
1500 Ohm (brown, green, red, gold)
3300 Ohm (orange, orange, red)
Variable Resistor (0 to 10000 Ohms)
Capacitor (100 uF)
Experimenting with a capacitor.
Capacitors are similar to rechargeable batteries.
Plug the capacitor into your breadboard and connect the battery to it.
(Remember that the capacitor has a "+" and "-" side.
(The minus side is visible in the image above.)
In less than a second the capacitor will be charged.
Remove the battery wires from your capacitor and connect the capacitor to
an LED as shown in the picture below.
Your LED will "blink" once.
Note that the battery is disconnected.
Instead of a wire try using a resistor to connect your LED
to the capacitor, the LED may glow longer.
Caution! Only charge your capacitor with the AA batteries provided.
NOT … LEDLERİN DEGERLERİ
Hila Research Centre
Resistor Colour Code
Resistors are electronic devices used to reduce the current flowing in a circuit. Resistance is measured in OHMs. Resistors are identified by a colour code. The first two colour bands represent numbers, the third colour band is called the multiplier. A simple way to use this third colour band is to think of it as representing the number of 0's to be added to the first two numbers.
Many resistors have a fourth colour band, usually silver or gold. This represents the tolerance of the resistor. A gold band indicates a tolerance of + or - 5%. The gold band does not contribute to the value of the resistor.
Colour Code:
Black - 0, Brown - 1, Red - 2, Orange - 3, Yellow - 4, Green - 5, Blue - 6,Violet - 7, Grey - 8, White - 9
In the examples above, R1 has colour bands brown, black, red and gold. (brown = 1, black = 0, red = 2 and gold indicates a tolerance of 5%)
The value of R1 is 1(brown), 0(black) and 00(red) = 1000 Ohms.
R2 has colour bands green, blue, yellow and gold. (green = 5, blue = 6, yellow = 4 and gold indicates a tolerance of 5%)
The value of R2 is 5(green), 6(blue) and 0000(yellow) = 560,000 Ohms.
