0–99999.9Ω Adjustable Resistance Box | Variable Resistor Lab Tool
0–99999.9Ω Adjustable Resistance Box | Variable Resistor Lab Tool
0–99999.9Ω Adjustable Resistance Box – Physics Teaching & Lab Equipment
Take your physics experiments and classroom demonstrations to the next level with this precision Adjustable Resistance Box. Spanning a wide range of 0 to 99,999.9 ohms (Ω), this variable load resistor is the ideal tool for verifying Ohm's Law, measuring electromotive force (EMF), determining unknown resistances, and regulating circuit current — all with easy dial-based precision.
Key Features
- Wide Resistance Range: 0–99999.9Ω across six dial positions (×100K, ×10K, ×1K, ×100, ×10, ×1) for highly accurate, step-by-step adjustment.
- Verify Ohm's Law: Ideal for demonstrating and verifying Ohm's Law in physics circuits.
- Voltage Range Expansion: Use as an additional resistor to extend the voltage measurement range of your instruments.
- Unknown Resistance Measurement: Quickly determine unknown resistances in a variety of circuit configurations.
- EMF & Internal Resistance Measurement: Accurately measure the electromotive force and internal resistance of power supplies.
- Current Regulation: Acts as a known reference resistor to set and regulate the desired current in a circuit.
- High Insulation: Insulation resistance between internal metal parts and outer shell exceeds 20MΩ for safe, reliable use.
- Durable Plastic Housing: Lightweight and sturdy black plastic enclosure built for classroom and laboratory environments.
Specifications
| Resistance Range | 0 – 99,999.9 Ω |
| Reference Power | 0.5 W |
| Operating Temperature | 15°C – 30°C |
| Insulation Resistance | > 20 MΩ |
| Material | Plastic |
| Color | Black |
| Battery Required | No |
| Country of Origin | Made in Mainland China |
How to Use
Connect the two terminals to your circuit or measuring instrument (such as a multimeter). Adjust the corresponding dials to your desired position. Each knob pointer reading is multiplied by its respective multiplier (×100K, ×10K, ×1K, ×100, ×10, ×1) and the values are summed to obtain the total resistance value displayed at the current knob positions.
What's in the Box
- 1× Adjustable Resistance Box (0–99999.9Ω)
Notes
- Colors may vary slightly from images due to screen display differences.
- Please allow a tolerance of 1mm–1cm due to manual measurement.
For a deeper understanding of resistance, Ohm's Law, and circuit fundamentals, visit the NIST – Electrical Units Reference for authoritative standards and definitions used in electrical measurement.
Frequently Asked Questions
Q: What is an adjustable resistance box used for in physics experiments?
A: An adjustable resistance box is used in physics and electrical engineering experiments to set precise, known resistance values in a circuit. Common applications include verifying Ohm's Law, measuring unknown resistances, determining the electromotive force (EMF) and internal resistance of a power supply, and regulating circuit current for controlled testing.
Q: What is the resistance range of this variable resistor?
A: This resistance box covers a range of 0 to 99,999.9 ohms (Ω), adjustable via six dials with multipliers of ×1, ×10, ×100, ×1K, ×10K, and ×100K. Simply sum the readings from each dial multiplied by their respective multipliers to get your total resistance value.
Q: Is this resistance box suitable for classroom teaching?
A: Yes — this variable resistance box is specifically designed for physics teaching and educational laboratory use. Its clear dial interface makes it easy for students to understand resistance concepts hands-on, and its wide range of 0–99999.9Ω covers virtually all standard high school and university-level physics experiments.
Q: Does this resistance box require batteries?
A: No. The resistance box does not require any batteries. It is a passive component that simply needs to be connected into your circuit or to a measuring instrument such as a multimeter to function.