Basic Electricity Practice Exam

A 5-band resistor has bands Brown, Black, Black, Red, Gold. What is its resistance and tolerance?

1 kΩ ±5% 100 Ω ±5% 1 MΩ ±5% 10 kΩ ±5%

Correct Answer:

10 kΩ ±5%

Explanation:

Reading a 5-band resistor involves three significant digits, a multiplier, and a tolerance. Brown, Black, Black give 1-0-0, so the digits are 100. The multiplier band is red, which represents 10^2 (100), so 100 × 100 = 10,000 ohms. The final band is gold, meaning a tolerance of ±5%. So the resistor is 10 kΩ with ±5% tolerance.

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