Electronics quiz
Resistors quiz
Color codes, series vs. parallel, tolerance and what R1 means on a board.
20 questions in the app. A few of them, with their answers:
What does a resistor's 4th color band typically tell you?
- Its capacitance
- Its tolerance ✓
- Its inductance
- Its forward voltage
Answer The 4th band (e.g. gold or silver) gives the tolerance - how far the real value may vary from nominal.
Two equal resistors of value R are placed in SERIES. What is the total resistance?
- R / 2
- R
- 2R ✓
- R²
Answer Resistances in series simply add: R + R = 2R.
Two equal resistors of value R are placed in PARALLEL. What is the total resistance?
- 2R
- R
- R / 2 ✓
- R²
Answer Equal resistors in parallel halve the resistance: (R×R)/(R+R) = R/2.
A gold 4th band on a resistor typically indicates:
- ±1% tolerance
- ±5% tolerance ✓
- ±10% tolerance
- ±20% tolerance
Answer Gold is the standard color for ±5% tolerance in the resistor color code.
What does a resistor's tolerance rating (e.g. ±5%) tell you?
- How far its real value may vary from the stated value ✓
- Its maximum operating temperature
- Its power rating in watts
- Its exact color code
Answer Tolerance bounds the manufacturing spread around the nominal value - a 100 Ω ±5% resistor measures 95-105 Ω.