Resistor Color Code Flashcards: 4 Bands, 5 Bands & Tolerance

Question 1

In a conventional 4-band resistor code, what does each band mean from left to right?

Accepted Answer

Two significant digits, multiplier, tolerance.

Join the first two digits into one number, then multiply.

Question 2

In a conventional resistor code, what does a black band in a significant-digit position contribute?

Accepted Answer

The digit 0.

Keep it in the number. A zero digit does not make the whole resistance zero.

Question 3

Conventional 4-band code, read left to right: orange–white–brown–gold. Nominal resistance and tolerance?

Accepted Answer

390 Ω ±5%.

Orange–white gives 39; brown multiplies by 10. The final gold band gives ±5%.

Question 4

In the multiplier position of a conventional resistor code, what factor does black mean?

Accepted Answer

×1.

A black multiplier leaves the significant-digit number unchanged.

Question 5

In a conventional 5-band resistor code, what does each band mean from left to right?

Accepted Answer

Three significant digits, multiplier, tolerance.

The third band is another digit; the multiplier moves to the fourth position.

Question 6

Conventional 5-band code, read left to right: red–black–blue–black–brown. Nominal resistance and tolerance?

Accepted Answer

206 Ω ±1%.

The digits are 2, 0, 6; the black multiplier is ×1. Final brown means ±1%.

Question 7

In the tolerance position of a conventional resistor code, what does gold mean?

Accepted Answer

±5%.

This percentage describes a permitted deviation from the nominal resistance in the stated tolerance model.

Question 8

Can gold or silver be a significant digit in a conventional 4- or 5-band resistor code?

Accepted Answer

No. Neither color represents a significant digit.

Gold and silver are used for multipliers or tolerances in this scheme.

Question 9

In the multiplier position of a conventional resistor code, what factor does gold mean?

Accepted Answer

×0.1.

Divide the significant-digit number by 10.

Question 10

Conventional 5-band code, read left to right: brown–red–white–brown–gold. Nominal resistance and tolerance?

Accepted Answer

1.29 kΩ ±5%.

The digits give 129; ×10 gives 1290 Ω. Final gold means ±5%.

Question 11

In the tolerance position of a conventional resistor code, what does red mean?

Accepted Answer

±2%.

Read the band by its role: red can mean a digit, a multiplier, or a tolerance.

Question 12

Express 0.24 MΩ in kΩ.

Accepted Answer

240 kΩ.

One megaohm is 1000 kiloohms: 0.24 × 1000 = 240.

Question 13

In the multiplier position of a conventional resistor code, what factor does silver mean?

Accepted Answer

×0.01.

Divide the significant-digit number by 100.

Question 14

Conventional 4-band code, read left to right: violet–white–gold–silver. Nominal resistance and tolerance?

Accepted Answer

7.9 Ω ±10%.

The digits give 79; gold multiplies by 0.1. Final silver means ±10%.

Question 15

A conventional 5-band resistor ends with a gold band. Does having five bands make its tolerance ±1%?

Accepted Answer

No. Its final gold band means ±5%.

Band count changes the number of significant digits. It does not replace the tolerance band.

Question 16

Conventional 4-band code for 820 Ω ±2%, written left to right?

Accepted Answer

Gray–red–brown–red.

82 × 10 = 820 Ω. The last red band specifies ±2%.

Question 17

In the tolerance position of a conventional resistor code, what does brown mean?

Accepted Answer

±1%.

A brown tolerance band means one percent, not one ohm.

Question 18

Conventional 4-band code, read left to right: yellow–blue–silver–gold. Nominal resistance and tolerance?

Accepted Answer

0.46 Ω ±5%.

The digits give 46; silver multiplies by 0.01. Final gold means ±5%.

Question 19

Conventional 5-band code for 64.2 kΩ ±1%, written left to right?

Accepted Answer

Blue–yellow–red–red–brown.

642 × 100 = 64,200 Ω. Final brown specifies ±1%.

Question 20

For a nominal 1200 Ω resistor with ±5% tolerance, what is the nominal tolerance interval?

Accepted Answer

1140–1260 Ω, including both endpoints.

5% of 1200 Ω is 60 Ω; subtract and add 60 Ω.

Question 21

In the multiplier position of a conventional resistor code, what factor does violet mean?

Accepted Answer

×10,000,000.

That is ten million, or 10⁷.

Question 22

Conventional 4-band code, read left to right: blue–brown–yellow–brown. Nominal resistance and tolerance?

Accepted Answer

610 kΩ ±1%.

61 × 10,000 = 610,000 Ω. Final brown means ±1%.

Question 23

Conventional 4-band code for 9.1 Ω ±10%, written left to right?

Accepted Answer

White–brown–gold–silver.

91 × 0.1 = 9.1 Ω. Final silver specifies ±10%.

Question 24

For a nominal 75 Ω resistor with ±2% tolerance, what is the nominal tolerance interval?

Accepted Answer

73.5–76.5 Ω, including both endpoints.

2% of 75 Ω is 1.5 Ω.

Question 25

In the multiplier position of a conventional resistor code, what factor does white mean?

Accepted Answer

×1,000,000,000.

That is one billion, or 10⁹.

Question 26

Conventional 5-band code, read left to right: green–orange–black–green–red. Nominal resistance and tolerance?

Accepted Answer

53 MΩ ±2%.

530 × 100,000 = 53,000,000 Ω. Final red means ±2%.

Question 27

Conventional 5-band code for 3.16 Ω ±1%, written left to right?

Accepted Answer

Orange–brown–blue–silver–brown.

316 × 0.01 = 3.16 Ω. Final brown specifies ±1%.

Question 28

For a nominal 0.82 Ω resistor with ±5% tolerance, what is the nominal tolerance interval without rounding?

Accepted Answer

0.779–0.861 Ω, including both endpoints.

The deviation is 0.82 × 0.05 = 0.041 Ω.

Question 29

In the multiplier position of a conventional resistor code, what factor does gray (grey) mean?

Accepted Answer

×100,000,000.

That is one hundred million, or 10⁸.

Question 30

Conventional 4-band code, read left to right: brown–gray–blue–gold. Nominal resistance and tolerance?

Accepted Answer

18 MΩ ±5%.

18 × 1,000,000 = 18,000,000 Ω. Final gold means ±5%.

Question 31

In the nominal interval model, a resistor is 250 Ω ±10%. Is an exact hypothetical value of 275 Ω inside, on a boundary, or outside?

Accepted Answer

On the upper boundary, so it is included.

The interval is 225–275 Ω. This exact-number exercise ignores measurement uncertainty.

Question 32

Conventional 4-band code for 36 MΩ ±5%, written left to right?

Accepted Answer

Orange–blue–blue–gold.

36 × 1,000,000 = 36 MΩ. Final gold specifies ±5%.

Question 33

For a nominal 2.4 kΩ resistor with ±1% tolerance, what is the nominal tolerance interval in kΩ?

Accepted Answer

2.376–2.424 kΩ, including both endpoints.

The deviation is 0.024 kΩ. Keep the same unit throughout.

Question 34

Conventional 4-band code, read left to right: blue–black–orange–gold. A learner gets 0 Ω because black is 0. Correct the nominal value.

Accepted Answer

60 kΩ.

Blue–black forms 60, then orange multiplies by 1000. The zero is a digit inside 60.

Question 35

In the nominal interval model, a resistor is 2000 Ω ±2%. Is an exact hypothetical value of 2041 Ω inside or outside?

Accepted Answer

Outside.

The inclusive interval is 1960–2040 Ω. The hypothetical value is 1 Ω above the upper limit; measurement uncertainty is outside this exercise.

Question 36

Conventional 5-band code for 91.3 MΩ ±2%, written left to right?

Accepted Answer

White–brown–orange–green–red.

913 × 100,000 = 91.3 MΩ. Final red specifies ±2%.

Question 37

Conventional 4-band code, read left to right: green–red–gold–brown. A learner treats gold as the tolerance. Give the correct nominal resistance and tolerance.

Accepted Answer

5.2 Ω ±1%.

Gold is the third band, so it multiplies 52 by 0.1. Final brown supplies ±1%.

Question 38

A nominal 6.8 Ω resistor has ±1% tolerance. A learner rounds the deviation to 0.07 Ω before finding the limits. What is the unrounded interval?

Accepted Answer

6.732–6.868 Ω.

Use the exact deviation, 6.8 × 0.01 = 0.068 Ω, before subtracting and adding.

Question 39

A conventional 5-band code is listed from one end: brown–green–black–brown–red. Reading direction and physical spacing are unknown. Is one nominal resistance uniquely determined?

Accepted Answer

No. Both directions give valid readings.

As listed: 150 × 10 = 1500 Ω ±2%.

Reversed: red–brown–black–green–brown gives 210 × 100,000 = 21 MΩ ±1%. More orientation evidence is needed.

Question 40

A calculation gives 72,000 Ω. A learner writes 72 MΩ. Correct the unit conversion.

Accepted Answer

72 kΩ, or 0.072 MΩ.

Divide ohms by 1000 for kiloohms, or by 1,000,000 for megaohms.

Question 41

Does a ±5% resistor tolerance mean there is a 95% probability that its resistance lies in the nominal interval?

Accepted Answer

No. Tolerance is not a probability distribution.

It specifies a relative allowed deviation under the applicable specifications. The percentage alone does not give probabilities or cover every operating condition.

Question 42

Does seeing five bands on an unfamiliar real component prove that it uses the conventional 5-band resistor code?

Accepted Answer

No. Confirm the component and marking scheme.

These cards assume conventional resistor markings. Special manufacturer schemes and six-band temperature-coefficient markings are outside this deck.

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Resistor Color Code Flashcards: 4 Bands, 5 Bands & Tolerance