Resistor
In most electrical circuits, we connect the various circuit components using copper wires. This is because copper is an electrical conductor material is excellent. Copper electrical resistance, very low. However, a number of connections on the circuit requires electrical resistance greater than can be provided by copper wire. This is why we need a resistor.
Photo below shows a typical fixed resistor. Type resistors are sold in a range of specific resistance values, ranging from less than 1 Ω to 10 MΩ max.
Figure below shows two different symbols, which are used to present the resistors in an electrical circuit diagram.
Preference values
Resistors are made with certain values (in units of ohms, or Ω):
1.0 1.1 1.2 1.3 1.5 1.6 1.8 2.0 2.2 2.4 2.7 3.0 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1
After these 24 values, the same sequence of values will be repeated in multiples of tens:
10 11 12 13 ... until ... 91, then
100 110 120 130 ... until ... 910, then
1 k 1.1 k 1.2 ... until ... 9.1 k, then
11 k 10 k 12 k ... until ... 91 k, then
110 k 100 k 120 k ... until ... 910 k, then
1 M 1.1 M 1.2 M ... until ... 9.1 M and 10 M
Photo below shows a typical fixed resistor. Type resistors are sold in a range of specific resistance values, ranging from less than 1 Ω to 10 MΩ max.
Figure below shows two different symbols, which are used to present the resistors in an electrical circuit diagram.
Preference values
Resistors are made with certain values (in units of ohms, or Ω):
1.0 1.1 1.2 1.3 1.5 1.6 1.8 2.0 2.2 2.4 2.7 3.0 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1
After these 24 values, the same sequence of values will be repeated in multiples of tens:
10 11 12 13 ... until ... 91, then
100 110 120 130 ... until ... 910, then
1 k 1.1 k 1.2 ... until ... 9.1 k, then
11 k 10 k 12 k ... until ... 91 k, then
110 k 100 k 120 k ... until ... 910 k, then
1 M 1.1 M 1.2 M ... until ... 9.1 M and 10 M
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