Is 123 Toolbox free to use?

Yes. Every tool on 123 Toolbox is free and runs directly in your browser — no account or payment required.

Are my files uploaded to a server?

No. Files and text are processed locally in your browser and are not uploaded by 123 Toolbox, except for a few tools that clearly depend on an external resource.

What kinds of tools are available?

123 Toolbox includes hundreds of tools for PDFs, images, developers, designers, Khmer language, geospatial data, security, math, and everyday work.

Which languages does 123 Toolbox support?

The interface supports English, Khmer, and a bilingual English–Khmer mode.

How do I use Electronics Calculators?

Pick the section you need (resistor color code, LED resistor, voltage divider, or Ohm's law) Enter the values you know Read the calculated result

Is Electronics Calculators free to use?

Yes. Electronics Calculators on 123 Toolbox is free and runs directly in your browser — no account or payment required.

Do I need to install anything to use Electronics Calculators?

No installation is required. It runs in a modern web browser and processes your input locally on your device.

Is Electronics Calculators available in Khmer?

Yes. The 123 Toolbox interface supports English, Khmer, and a bilingual English–Khmer mode.

All tools / ឧបករណ៍ទាំងអស់Electronics Calculators — ម៉ាស៊ីនគណនាអេឡិចត្រូនិក

Electronics Calculators

Electronics ម៉ាស៊ីនគណនាs

Resistor color codes, LED series resistors, voltage dividers, and Ohm's law. / កូដពណ៌រេស៊ីស្ទ័រ រេស៊ីស្ទ័រ LED បំរែបំរួលតង់ស្យុង និងច្បាប់អូម។

Resistor color code (4-band) / កូដពណ៌រេស៊ីស្ទ័រ (៤ខ្សែ)

Band 1 / ខ្សែទី ១Band 2 / ខ្សែទី ២Multiplier / មេគុណគុណTolerance / ភាពអត់ឱន

Resistance / រេស៊ីស្ទ័រ

4.7 kΩ

Tolerance / ភាពអត់ឱន ±5%

Resistor value → color bands / តម្លៃរេស៊ីស្ទ័រ → ខ្សែពណ៌

Resistance (e.g. 4700, 4.7k, 1M) / រេស៊ីស្ទ័រ (ឧ. 4700, 4.7k, 1M)

≈ 4.7 kΩ · 47 × 10^2

LED series resistor / រេស៊ីស្ទ័រ LED

Supply voltage (V) / តង់ស្យុងផ្គត់ផ្គង់ (V)LED forward voltage (V) / តង់ស្យុង LED (V)LED current (mA) / ចរន្ត LED (mA)

Calculated resistor / រេស៊ីស្ទ័រដែលបានគណនា

150 Ω

Nearest standard (E24) / តម្លៃស្តង់ដារជិតបំផុត (E24)

150 Ω

Power dissipated / ថាមពលបាត់បង់

60 mW

Voltage divider / បំរែបំរួលតង់ស្យុង

Input voltage (V) / តង់ស្យុងបញ្ចូល (V)R1 (Ω) / R1 (Ω)R2 (Ω) / R2 (Ω)

Output voltage / តង់ស្យុងលទ្ធផល

2.5 V

Current / ចរន្ត

0.25 mA

Ohm's law / ច្បាប់អូម

Solve for / រកតម្លៃ

Voltage (V) / តង់ស្យុង (V)Current (A) / ចរន្ត (A)

Resistance (Ω) / កម្លាំងទប់ (Ω)

Power (W) / ថាមពល (W)

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Frequently asked questions / សំណួរដែលសួរញឹកញាប់

Calculate resistor color codes, LED series resistors, voltage dividers, and Ohm's law — all in your browser. / គណនាកូដពណ៌រេស៊ីស្ទ័រ រេស៊ីស្ទ័រ LED បំរែបំរួលតង់ស្យុង និងច្បាប់អូម — ទាំងអស់ក្នុងកម្មវិធីរុករករបស់អ្នក។

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