User Manual

8
Components Introduction
Resistor
Resistor is an electronic element that can limit the branch current. A fixed resistor is one whose
resistance cannot be changed, when that of a potentiometer or variable resistor can be
adjusted.
The resistors in this kit are fixed ones. It is essential in the circuit to protect the connected
components. Figure (a) below shows a 220Ω resistor. Ω is the unit of resistance and the larger
includes KΩ, MΩ, etc. Their relationship can be shown as follows: 1 MΩ=1000 KΩ，1 KΩ = 1000
Ω, which means 1 MΩ = 1000,000 Ω = 10^6 Ω. Figure (b) and (c) show two generally used
circuit symbols for resistor. Normally, the resistance is marked on it. So if you see these symbols
in a circuit, it stands for a resistor.
(a)
(b） (c)
The resistance can be marked directly, in color code, and by character. The resistors offered
in this kit are marked by different colors. Namely, the bands on the resistor indicate the
resistance.
When using a resistor, w e need to know its resistance first. Here are two methods: you can
observ e the bands on the resistor, or use a multimeter to measure the resistance. You are
recommended to use the first method as it is more convenient and faster. If you are not sure
about the value, use the multimeter.
In the kit, a Resistor Color Code Calculator card is provided as shown below:
(d)
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