Ohm [phát âm tiếng Việt: Ôm], ký hiệu Ω, đơn vị đo điện trở R [X, Z] trong hệ SI, đặt tên theo nhà Vật lý Đức Georg Simon Ohm. Đơn vị Ohm xuất phát từ định luật Ohm.
A laboratory one-ohm standard resistor, circa 1917.Ohm
Một Ohm là giá trị điện trở của vật khi đặt giữa hiệu điện thế 1 volt thì có dòng điện cường độ 1 ampere chạy qua.
R = 1 Ω = 1 V 1 A = 1 k g ⋅ m 2 s 3 ⋅ A 2 {\displaystyle R=1\Omega ={\frac {\mathrm {1V} }{\mathrm {1A} }}=1{\frac {\mathrm {kg} \cdot \mathrm {m} ^{2}}{\mathrm {s} ^{3}\cdot \mathrm {A} ^{2}}}}Y | YΩ | 1 × 1024 Ω | Yôtaôm |
Z | ZΩ | 1 × 1021 Ω | Zêtaôm |
E | EΩ | 1 × 1018 Ω | Êxaôm |
P | PΩ | 1 × 1015 Ω | Pêtaôm |
T | TΩ | 1 × 1012 Ω | Têraôm |
G | GΩ | 1 × 109 Ω | Gigaôm |
M | MΩ | 1 × 106 Ω | Mêgaôm |
k | kΩ | 1 × 103 Ω | kilôôm |
h | hΩ | 1 × 102 Ω | héctôôm |
da | daΩ | 1 × 101 Ω | đêcaôm |
d | dΩ | 1 × 10−1 Ω | đêxiôm |
c | cΩ | 1 × 10−2 Ω | xentiôm |
m | mΩ | 1 × 10−3 Ω | miliôm |
μ | μΩ | 1 × 10−6 Ω | micrôôm |
n | nΩ | 1 × 10−9 Ω | nanôôm |
p | pΩ | 1 × 10−12 Ω | picôôm |
f | fΩ | 1 × 10−15 Ω | femtôôm |
a | aΩ | 1 × 10−18 Ω | atôôm |
z | zΩ | 1 × 10−21 Ω | zeptôôm |
y | yΩ | 1 × 10−24 Ω | yóctôôm |
1 YΩ | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1015 | 1 × 1018 | 1 × 1021 | 1 × 1022 | 1 × 1023 | 1 × 1024 | 1 × 1025 | 1 × 2626 | 1 × 1027 | 1 × 1030 | 1 × 1033 | 1 × 1036 | 1 × 1039 | 1 × 1042 | 1 × 1045 | 1 × 1048 |
1 ZΩ | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1015 | 1 × 1018 | 1 × 1019 | 1 × 1020 | 1 × 1021 | 1 × 1022 | 1 × 1023 | 1 × 2624 | 1 × 1027 | 1 × 1030 | 1 × 1033 | 1 × 1036 | 1 × 1039 | 1 × 1042 | 1 × 1045 |
1 EΩ | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1015 | 1 × 1016 | 1 × 1017 | 1 × 1018 | 1 × 1019 | 1 × 1020 | 1 × 1021 | 1 × 2624 | 1 × 1027 | 1 × 1030 | 1 × 1033 | 1 × 1036 | 1 × 1039 | 1 × 1042 |
1 PΩ | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1013 | 1 × 1014 | 1 × 1015 | 1 × 1016 | 1 × 1017 | 1 × 1018 | 1 × 1021 | 1 × 2624 | 1 × 1027 | 1 × 1030 | 1 × 1033 | 1 × 1036 | 1 × 1039 |
1 TΩ | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1010 | 1 × 1011 | 1 × 1012 | 1 × 1013 | 1 × 1014 | 1 × 1015 | 1 × 1018 | 1 × 1021 | 1 × 2624 | 1 × 1027 | 1 × 1030 | 1 × 1033 | 1 × 1036 |
1 GΩ | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 107 | 1 × 108 | 1 × 109 | 1 × 1010 | 1 × 1011 | 1 × 1012 | 1 × 1015 | 1 × 1018 | 1 × 1021 | 1 × 2624 | 1 × 1027 | 1 × 1030 | 1 × 1033 |
1 MΩ | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 104 | 1 × 105 | 1 × 106 | 1 × 107 | 1 × 108 | 1 × 109 | 1 × 1012 | 1 × 1015 | 1 × 1018 | 1 × 1021 | 1 × 2624 | 1 × 1027 | 1 × 1030 |
1 kΩ | 1 × 10−21 | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 101 | 1 × 102 | 1 × 103 | 1 × 104 | 1 × 105 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1015 | 1 × 1018 | 1 × 1021 | 1 × 2624 | 1 × 1027 |
1 hΩ | 1 × 10−22 | 1 × 10−19 | 1 × 10−16 | 1 × 10−13 | 1 × 10−10 | 1 × 10−7 | 1 × 10−4 | 1 × 10−1 | 1 | 1 × 101 | 1 × 102 | 1 × 103 | 1 × 104 | 1 × 105 | 1 × 108 | 1 × 1011 | 1 × 1014 | 1 × 1017 | 1 × 1020 | 1 × 1023 | 1 × 1026 |
1 daΩ | 1 × 10−23 | 1 × 10−20 | 1 × 10−17 | 1 × 10−14 | 1 × 10−11 | 1 × 10−8 | 1 × 10−5 | 1 × 10−2 | 1 × 10−1 | 1 | 1 × 101 | 1 × 102 | 1 × 103 | 1 × 104 | 1 × 107 | 1 × 1010 | 1 × 1013 | 1 × 1016 | 1 × 1019 | 1 × 1022 | 1 × 1025 |
1 Ω | 1 × 10−24 | 1 × 10−21 | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 × 10−2 | 1 × 10−1 | 1 | 1 × 101 | 1 × 102 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1015 | 1 × 1018 | 1 × 1021 | 1 × 1024 |
1 dΩ | 1 × 10−25 | 1 × 10−22 | 1 × 10−19 | 1 × 10−16 | 1 × 10−13 | 1 × 10−10 | 1 × 10−7 | 1 × 10−4 | 1 × 10−3 | 1 × 10−2 | 1 × 10−1 | 1 | 1 × 101 | 1 × 102 | 1 × 105 | 1 × 108 | 1 × 1011 | 1 × 1014 | 1 × 1017 | 1 × 1020 | 1 × 1023 |
1 cΩ | 1 × 10−26 | 1 × 10−23 | 1 × 10−20 | 1 × 10−17 | 1 × 10−14 | 1 × 10−11 | 1 × 10−8 | 1 × 10−5 | 1 × 10−4 | 1 × 10−3 | 1 × 10−2 | 1 × 10−1 | 1 | 1 × 101 | 1 × 104 | 1 × 107 | 1 × 1010 | 1 × 1013 | 1 × 1016 | 1 × 1019 | 1 × 1022 |
1 mΩ | 1 × 10−27 | 1 × 10−24 | 1 × 10−21 | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−5 | 1 × 10−4 | 1 × 10−3 | 1 × 10−2 | 1 × 10−1 | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1015 | 1 × 1018 | 1 × 1021 |
1 μΩ | 1 × 10−30 | 1 × 10−27 | 1 × 10−23 | 1 × 10−21 | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−8 | 1 × 10−7 | 1 × 10−6 | 1 × 10−5 | 1 × 10−4 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1015 | 1 × 1018 |
1 nΩ | 1 × 10−33 | 1 × 10−30 | 1 × 10−27 | 1 × 10−24 | 1 × 10−21 | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−11 | 1 × 10−10 | 1 × 10−9 | 1 × 10−8 | 1 × 10−7 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 | 1 × 1015 |
1 pΩ | 1 × 10−36 | 1 × 10−33 | 1 × 10−30 | 1 × 10−27 | 1 × 10−24 | 1 × 10−21 | 1 × 10−18 | 1 × 10−15 | 1 × 10−14 | 1 × 10−13 | 1 × 10−12 | 1 × 10−11 | 1 × 10−10 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 109 | 1 × 1012 |
1 fΩ | 1 × 10−39 | 1 × 10−36 | 1 × 10−33 | 1 × 10−30 | 1 × 10−27 | 1 × 10−24 | 1 × 10−21 | 1 × 10−18 | 1 × 10−17 | 1 × 10−16 | 1 × 10−15 | 1 × 10−14 | 1 × 10−13 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 | 1 × 109 |
1 aΩ | 1 × 10−42 | 1 × 10−39 | 1 × 10−36 | 1 × 10−33 | 1 × 10−30 | 1 × 10−27 | 1 × 10−24 | 1 × 10−23 | 1 × 10−22 | 1 × 10−21 | 1 × 10−20 | 1 × 10−19 | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 | 1 × 106 |
1 zΩ | 1 × 10−45 | 1 × 10−42 | 1 × 10−39 | 1 × 10−36 | 1 × 10−33 | 1 × 10−30 | 1 × 10−27 | 1 × 10−24 | 1 × 10−23 | 1 × 10−22 | 1 × 10−21 | 1 × 10−20 | 1 × 10−19 | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 | 1 × 103 |
1 yΩ | 1 × 10−48 | 1 × 10−45 | 1 × 10−42 | 1 × 10−39 | 1 × 10−36 | 1 × 10−33 | 1 × 10−30 | 1 × 10−27 | 1 × 10−26 | 1 × 10−25 | 1 × 10−24 | 1 × 10−23 | 1 × 10−22 | 1 × 10−21 | 1 × 10−18 | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 1 × 10−3 | 1 |
- Điện trở
- Điện trở suất
- Volt
- Ampere
- Kelvin
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