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A resistance box is a device used in laboratories to estimate and compare resistance values. Here are some key points about resistance boxes: Purpose: The primary application of a resistance box is to control specific current values in a circuit. It allows you to adjust resistance without physically replacing resistors. Types: High Resistance Box: Ranges from 1? to 5000? or more. Low Resistance Box: Values between 1? and 500?. Fractional Resistance Box: Contains fractional values (0.1? to 50?).