In a resistor, the resistance stays the same.

• A. True
• B. False
• C. It depends on the color of the resistor
• D. It depends on humidity

Answer: (A)

A resistor is designed to have a fixed resistance, set by its material, length, and cross‑section. When the temperature is stable, this resistance stays essentially the same, so current and voltage are related by V = IR with that constant R. The color bands just indicate the resistance value and don’t affect it, and humidity doesn’t matter for a dry resistor in normal conditions. If the resistor heats up significantly, its resistance can change a little due to temperature, but under usual operating conditions the resistance is treated as constant.