{"product_id":"adjustable-resistance-box-0-99999-ohm-physics-teaching-equipment","title":"0-99999.9Ω Adjustable Resistance Box | Physics Teaching Tool","description":"\n\u003ch2\u003e0–99999.9Ω Adjustable Variable Resistance Box for Physics \u0026amp; Electrical Experiments\u003c\/h2\u003e\n\u003cp\u003eThis precision \u003cstrong\u003eadjustable resistance box\u003c\/strong\u003e is an essential piece of physics teaching equipment for classrooms, labs, and DIY electronics enthusiasts. With a wide measurement range of \u003cstrong\u003e0 to 99999.9Ω\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eVerify Ohm's Law\u003c\/strong\u003e — Ideal for demonstrating and confirming Ohm's Law in classroom and lab circuit experiments.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eVoltage Range Expansion\u003c\/strong\u003e — Use as a series resistor to extend the voltage measurement range of instruments.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eMeasure Unknown Resistances\u003c\/strong\u003e — Substitute a known resistance to calculate the value of an unknown component.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eElectromotive Force (EMF) Measurement\u003c\/strong\u003e — Measure the electromotive force and internal resistance of a power supply with ease.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCurrent Regulation\u003c\/strong\u003e — Serve as a known resistor in a circuit to control and set required current levels.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSix-Decade Dial Design\u003c\/strong\u003e — Six independent knobs with clearly marked multipliers for fast, intuitive resistance selection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMeasurement Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e0 – 99999.9Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eReference Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e0.5W\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e15–30°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eInsulation Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u0026gt;20MΩ (between internal circuit metal parts and outer shell)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eKnob Multipliers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e×100K, ×10K, ×1K, ×100, ×10, ×1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003ePlastic housing\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eBattery Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eConnect the two output terminals to your circuit or measuring instrument (e.g., a multimeter).\u003c\/li\u003e\n  \u003cli\u003eAdjust each dial knob to your desired digit for its decade position.\u003c\/li\u003e\n  \u003cli\u003eMultiply each knob's reading by its labeled multiplier (×100K, ×10K, ×1K, ×100, ×10, ×1).\u003c\/li\u003e\n  \u003cli\u003eSum all values to get your total resistance — ready to use instantly.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Adjustable Resistance Box (0–99999.9Ω)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eColors may vary slightly from product images due to screen and lighting differences.\u003c\/li\u003e\n  \u003cli\u003ePlease allow 1mm–1cm dimensional variation due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eDo not exceed the rated reference power of 0.5W to avoid damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on electrical safety standards and best practices in educational lab environments, visit \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA – Electrical Safety\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the total resistance range of this adjustable resistance box?\u003c\/h4\u003e\n\u003cp\u003eA: This variable resistance box covers a range of \u003cstrong\u003e0 to 99999.9 ohms\u003c\/strong\u003e, giving you six decades of adjustability using six independent dial knobs multiplied by ×100K, ×10K, ×1K, ×100, ×10, and ×1 respectively.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can this resistance box be used for high-power applications?\u003c\/h4\u003e\n\u003cp\u003eA: The resistance box is rated at a reference power of \u003cstrong\u003e0.5W\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this resistance box suitable for classroom physics teaching?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. This resistance box is specifically designed as \u003cstrong\u003ephysics teaching equipment\u003c\/strong\u003e and is ideal for demonstrating Ohm's Law, measuring electromotive force (EMF), measuring unknown resistances, and regulating current in educational circuit experiments.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I read the resistance value on this box?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the total resistance range of this adjustable resistance box?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"Can this resistance box be used for high-power applications?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The resistance box is rated at a reference power of 0.5W. It is designed for low-power educational and laboratory experiments. 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