How is a resistor’s tolerance typically conveyed if it is not printed numerically on the body?

Introduction / Context:The tolerance of a resistor indicates the allowed deviation from its nominal value (for example, ±1%, ±5%). Correctly reading tolerance helps ensure precision where needed and allows cost savings where wide tolerance is acceptable.

Given Data / Assumptions:

• Through-hole, color-banded resistors (common in labs and education).
• No printed numeric tolerance on the body.
• Standard color-code conventions are in use.

Concept / Approach:In the 4-band/5-band color code, one band denotes tolerance: gold (±5%), silver (±10%), brown (±1%), red (±2%), green (±0.5%), blue (±0.25%), violet (±0.1%), gray (±0.05%). If tolerance is not printed, it is recognized by this color band on the resistor's body.

Step-by-Step Solution:Identify the tolerance band (often the band spaced apart or last band).Map color to tolerance using standard chart (e.g., gold → ±5%).Record nominal value, multiplier, and tolerance for specification or replacement.

Verification / Alternative check:Measure with an ohmmeter and compare to nominal ± tolerance window. This confirms that the color-code-indicated tolerance is consistent with the actual part within measurement accuracy.

Why Other Options Are Wrong:

• Keyed containers/size: Packaging and size do not encode tolerance.
• Ohmmeter reading: Shows present value, not rated tolerance category.

Common Pitfalls:

• Reading the resistor from the wrong end and misidentifying the tolerance band.
• Confusing tolerance with temperature coefficient; the latter is not encoded by the same color in basic 4/5-band systems.

Final Answer:color code