Resistor Color Expert
Level 2
10 Points
Introduction
If you want to build something using a Raspberry Pi, you'll probably use resistors.
Like the previous Resistor Color Duo and Resistor Color Trio exercises, you will be translating resistor color bands to human-readable labels.
- Each resistor has a resistance value.
- Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read. To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
- Each band acts as a digit of a number. For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.
Instructions
In this exercise, you are going to create a helpful program so that you don't have to remember the values of the bands. The program will take 1, 4, or 5 colors as input, and outputs the correct value, in ohms. The color bands are encoded as follows:
- Black: 0
- Brown: 1
- Red: 2
- Orange: 3
- Yellow: 4
- Green: 5
- Blue: 6
- Violet: 7
- Grey: 8
- White: 9
In resistor-color trio you decoded the first three colors.
For instance: orange-orange-brown translated to the main value 330.
In this exercise you will need to add tolerance to the mix.
Tolerance is the maximum amount that a value can be above or below the main value.
For example, if the last band is green, the maximum tolerance will be ±0.5%.
The tolerance band will have one of these values:
- Grey - 0.05%
- Violet - 0.1%
- Blue - 0.25%
- Green - 0.5%
- Brown - 1%
- Red - 2%
- Gold - 5%
- Silver - 10%
The four-band resistor is built up like this:
| Band_1 | Band_2 | Band_3 | band_4 |
|---|---|---|---|
| Value_1 | Value_2 | Multiplier | Tolerance |
Meaning
- orange-orange-brown-green would be 330 ohms with a ±0.5% tolerance.
- orange-orange-red-grey would be 3300 ohms with ±0.05% tolerance.
The difference between a four and five-band resistor is that the five-band resistor has an extra band to indicate a more precise value.
| Band_1 | Band_2 | Band_3 | Band_4 | band_5 |
|---|---|---|---|---|
| Value_1 | Value_2 | Value_3 | Multiplier | Tolerance |
Meaning
- orange-orange-orange-black-green would be 333 ohms with a ±0.5% tolerance.
- orange-red-orange-blue-violet would be 323M ohms with a ±0.10 tolerance.
There are also one band resistors. One band resistors only have the color black with a value of 0.
This exercise is about translating the resistor band colors into a label:
"... ohms ...%"
So an input of "orange", "orange", "black", "green" should return:
"33 ohms ±0.5%"
When there are more than a thousand ohms, we say "kiloohms". That's similar to saying "kilometer" for 1000 meters, and "kilograms" for 1000 grams.
So an input of "orange", "orange", "orange", "grey" should return:
"33 kiloohms ±0.05%"
When there are more than a million ohms, we say "megaohms".
So an input of "orange", "orange", "blue", "red" should return:
"33 megaohms ±2%"
Resistor Color Expert
Level 2
10 Points
Introduction
If you want to build something using a Raspberry Pi, you'll probably use resistors.
Like the previous Resistor Color Duo and Resistor Color Trio exercises, you will be translating resistor color bands to human-readable labels.
- Each resistor has a resistance value.
- Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read. To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
- Each band acts as a digit of a number. For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.
Instructions
In this exercise, you are going to create a helpful program so that you don't have to remember the values of the bands. The program will take 1, 4, or 5 colors as input, and outputs the correct value, in ohms. The color bands are encoded as follows:
- Black: 0
- Brown: 1
- Red: 2
- Orange: 3
- Yellow: 4
- Green: 5
- Blue: 6
- Violet: 7
- Grey: 8
- White: 9
In resistor-color trio you decoded the first three colors.
For instance: orange-orange-brown translated to the main value 330.
In this exercise you will need to add tolerance to the mix.
Tolerance is the maximum amount that a value can be above or below the main value.
For example, if the last band is green, the maximum tolerance will be ±0.5%.
The tolerance band will have one of these values:
- Grey - 0.05%
- Violet - 0.1%
- Blue - 0.25%
- Green - 0.5%
- Brown - 1%
- Red - 2%
- Gold - 5%
- Silver - 10%
The four-band resistor is built up like this:
| Band_1 | Band_2 | Band_3 | band_4 |
|---|---|---|---|
| Value_1 | Value_2 | Multiplier | Tolerance |
Meaning
- orange-orange-brown-green would be 330 ohms with a ±0.5% tolerance.
- orange-orange-red-grey would be 3300 ohms with ±0.05% tolerance.
The difference between a four and five-band resistor is that the five-band resistor has an extra band to indicate a more precise value.
| Band_1 | Band_2 | Band_3 | Band_4 | band_5 |
|---|---|---|---|---|
| Value_1 | Value_2 | Value_3 | Multiplier | Tolerance |
Meaning
- orange-orange-orange-black-green would be 333 ohms with a ±0.5% tolerance.
- orange-red-orange-blue-violet would be 323M ohms with a ±0.10 tolerance.
There are also one band resistors. One band resistors only have the color black with a value of 0.
This exercise is about translating the resistor band colors into a label:
"... ohms ...%"
So an input of "orange", "orange", "black", "green" should return:
"33 ohms ±0.5%"
When there are more than a thousand ohms, we say "kiloohms". That's similar to saying "kilometer" for 1000 meters, and "kilograms" for 1000 grams.
So an input of "orange", "orange", "orange", "grey" should return:
"33 kiloohms ±0.05%"
When there are more than a million ohms, we say "megaohms".
So an input of "orange", "orange", "blue", "red" should return:
"33 megaohms ±2%"