0-99999.9Ω Adjustable Resistance Box | Physics Teaching Tool
0-99999.9Ω Adjustable Resistance Box | Physics Teaching Tool
0–99999.9Ω Adjustable Variable Resistance Box for Physics & Electrical Experiments
This precision adjustable resistance box is an essential piece of physics teaching equipment for classrooms, labs, and DIY electronics enthusiasts. With a wide measurement range of 0 to 99999.9Ω and six dial knobs (×100K, ×10K, ×1K, ×100, ×10, ×1), you can dial in any resistance value quickly and accurately — no soldering required. Made in Mainland China.
Key Features
- ✅ Verify Ohm's Law — Ideal for demonstrating and confirming Ohm's Law in classroom and lab circuit experiments.
- ✅ Voltage Range Expansion — Use as a series resistor to extend the voltage measurement range of instruments.
- ✅ Measure Unknown Resistances — Substitute a known resistance to calculate the value of an unknown component.
- ✅ Electromotive Force (EMF) Measurement — Measure the electromotive force and internal resistance of a power supply with ease.
- ✅ Current Regulation — Serve as a known resistor in a circuit to control and set required current levels.
- ✅ Six-Decade Dial Design — Six independent knobs with clearly marked multipliers for fast, intuitive resistance selection.
Specifications
| Measurement Range | 0 – 99999.9Ω |
| Reference Power | 0.5W |
| Operating Temperature | 15–30°C |
| Insulation Resistance | >20MΩ (between internal circuit metal parts and outer shell) |
| Knob Multipliers | ×100K, ×10K, ×1K, ×100, ×10, ×1 |
| Color | Black |
| Material | Plastic housing |
| Battery Required | No |
| Country of Origin | Made in Mainland China |
How to Use
- Connect the two output terminals to your circuit or measuring instrument (e.g., a multimeter).
- Adjust each dial knob to your desired digit for its decade position.
- Multiply each knob's reading by its labeled multiplier (×100K, ×10K, ×1K, ×100, ×10, ×1).
- Sum all values to get your total resistance — ready to use instantly.
Package Includes
- 1× Adjustable Resistance Box (0–99999.9Ω)
Important Notes
- Colors may vary slightly from product images due to screen and lighting differences.
- Please allow 1mm–1cm dimensional variation due to manual measurement.
- Do not exceed the rated reference power of 0.5W to avoid damage.
For more information on electrical safety standards and best practices in educational lab environments, visit OSHA – Electrical Safety.
Frequently Asked Questions
Q: What is the total resistance range of this adjustable resistance box?
A: This variable resistance box covers a range of 0 to 99999.9 ohms, giving you six decades of adjustability using six independent dial knobs multiplied by ×100K, ×10K, ×1K, ×100, ×10, and ×1 respectively.
Q: Can this resistance box be used for high-power applications?
A: The resistance box is rated at a reference power of 0.5W. It is designed for low-power educational and laboratory experiments. Do not use it in circuits that exceed this power rating to avoid damage to the unit.
Q: Is this resistance box suitable for classroom physics teaching?
A: Absolutely. This resistance box is specifically designed as physics teaching equipment and is ideal for demonstrating Ohm's Law, measuring electromotive force (EMF), measuring unknown resistances, and regulating current in educational circuit experiments.
Q: How do I read the resistance value on this box?
A: Each of the six knobs displays a digit (0–9). Multiply each knob's digit by its labeled multiplier and add all six values together to get the total resistance. For example, setting knob ×1K to 3, ×100 to 5, and all others to 0 gives you 3×1000 + 5×100 = 3,500Ω.