1. Overview The GSX-J2361-1 type teaching resistance box is designed and produced according to the requirements of the National Education Commission for the compilation of the "Secondary Science Teaching Instrumentation Catalogue". It is mainly used as a standard resistor in physics teaching to verify Ohm's law or as an additional resistor. Expanding the range of the ammeter and voltmeter can also be used to measure the unknown resistance and make the variable resistance access electronic circuit to adjust the required operating point current and voltage. The resistance box can also be used to measure the electromotive force of the power supply and the internal resistance of the power supply. . It is an indispensable instrument in physical and electrical experiments. 2. Structural principle The resistance box is made of metal thin plate and aluminum alloy frame. The sealing structure changes the resistance of each group into a band switch form. The contact switch is rotated to different positions to achieve the purpose of transforming the resistance value. The internal resistance is low. The value part is made of high-stability manganese-copper wire wound on the insulating bracket without inductive winding. The high-resistance part adopts precision special gold film resistor. After strict screening, detection, aging and water immersion treatment, the resistance value is stable and correct. 3, the main technical performance 3-1, measurement range: 0 ~ 999999 Ω. 3-2, the minimum progress value: 1Ω. 3-3, accuracy: ± 1.5%. 3-4. Residual resistance tolerance: R0 < 0.5 Ω. 3-5, use temperature: 10 ~ 350C. 3-6. Relative humidity:
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