Green turned off
Resistors and their colour rings
The coloured rings on the resistors
stand for numbers. They are read
one after the other, starting at the
ring closest to the edge of the
resistors. The first two rings stand
for two digits, the third for added
zeros. Together they denote the
resistance in ohms. A fourth ring
indicates the accuracy. All resistors
in this calendar have a gold ring.
This means that the value can be
5% higher or lower than indicated
by the coloured rings. Your first
resistance is read like this:
Brown = 1, black = 0,
orange = 000, together 10,000
Ω
(Ohm), i.e. 10 k
Ω
(Kiloohm).
The resistance colour code
Colour
Ring 1
1st digit
Ring 2
2nd digit
Ring 3
Multiplier
Ring 4
Tolerance
black
0
1
brown
1
1
10
1 %
red
2
2
100
2 %
orange
3
3
1000
yellow
4
4
10000
green
5
5
100000
0,5 %
blue
6
6
1000000
violet
7
7
10000000
grey
8
8
white
9
9
gold
0,1
5 %
silver
0,01
10 %
4
Open the 4th door and remove the cable with two plugs. If you
install it along with the push button as shown in the picture, you
can switch off the green LED by pressing the button. If the button
is closed, you have built a by-pass for the electric current. The
current then no longer flows through the green LED, but through
the switch. The green LED goes off, but the red LED becomes a little
brighter at this moment.
In fact, the switch briefly closes
the green LED. This type of short-
circuit is permitted only because the
resistance in the circuit keeps the
current sufficiently low. However, a
direct short circuit of the battery in
the form of a connection between the
positive and negative poles must be
avoided at all costs!
