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exercises/practice/resistor-color-expert/.docs/instructions.md
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# Instructions | ||
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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 program will take a 1, 4, or 5 colors as input, and outputs the correct value, in ohms. | ||
The color bands are encoded as follows: | ||
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- Black: 0 | ||
- Brown: 1 | ||
- Red: 2 | ||
- Orange: 3 | ||
- Yellow: 4 | ||
- Green: 5 | ||
- Blue: 6 | ||
- Violet: 7 | ||
- Grey: 8 | ||
- White: 9 | ||
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In `resistor-color trio` you decoded the first three colors. | ||
- black: 0 | ||
- brown: 1 | ||
- red: 2 | ||
- orange: 3 | ||
- yellow: 4 | ||
- green: 5 | ||
- blue: 6 | ||
- violet: 7 | ||
- grey: 8 | ||
- white: 9 | ||
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In [`Resistor Color Trio`][resistor-color-trio-exercie] you decoded the first three color bands. | ||
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%. | ||
For example, if the last band is green, the maximum tolerance will be `±0.5%`. | ||
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The tolerance band will have one of these values: | ||
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- Grey - 0.05% | ||
- Violet - 0.1% | ||
- Blue - 0.25% | ||
- Green - 0.5% | ||
- Brown - 1% | ||
- Red - 2% | ||
- Gold - 5% | ||
- Silver - 10% | ||
- grey - 0.05% | ||
- violet - 0.1% | ||
- blue - 0.25% | ||
- green - 0.5% | ||
- brown - 1% | ||
- red - 2% | ||
- gold - 5% | ||
- silver - 10% | ||
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The four-band resistor is built up like this: | ||
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| Band_1 | Band_2 | Band_3 | band_4 | | ||
| ------- | ------- | ---------- | --------- | | ||
| Value_1 | Value_2 | Multiplier | Tolerance | | ||
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Meaning | ||
Examples: | ||
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- 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. | ||
- 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. | ||
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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. | ||
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| Band_1 | Band_2 | Band_3 | Band_4 | band_5 | | ||
| ------- | ------- | ------- | ---------- | --------- | | ||
| Value_1 | Value_2 | Value_3 | Multiplier | Tolerance | | ||
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Meaning | ||
Examples: | ||
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- 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. | ||
- 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. | ||
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There are also one band resistors. | ||
One band resistors only have the color black with a value of 0. | ||
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This exercise is about translating the resistor band colors into a label: | ||
This exercise is about translating an input `list` of resistor band colors into a label: | ||
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"... ohms ...%" | ||
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So an input of "orange", "orange", "black", "green" should return: | ||
So an input `list` of `["orange", "orange", "black", "green"]` should return: | ||
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"33 ohms ±0.5%" | ||
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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. | ||
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So an input of "orange", "orange", "orange", "grey" should return: | ||
So an input `list` of `["orange", "orange", "orange", "grey"]` should return: | ||
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"33 kiloohms ±0.05%" | ||
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When there are more than a million ohms, we say "megaohms". | ||
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So an input of "orange", "orange", "blue", "red" should return: | ||
So an input `list` of `["orange", "orange", "blue", "red"]` should return: | ||
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"33 megaohms ±2%" | ||
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[resistor-color-trio-exercie]: https://exercism.org/tracks/python/exercises/resistor-color-trio |
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exercises/practice/resistor-color-expert/.docs/introduction.md
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# Introduction | ||
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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. | ||
Like the previous [`Resistor Color Duo`][resistor-color-duo-exercise] and [`Resistor Color Trio`][resistor-color-trio-exercie] exercises, you will be translating resistor color bands to human-readable labels. | ||
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- 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. | ||
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[resistor-color-duo-exercise]: https://exercism.org/tracks/python/exercises/resistor-color-duo | ||
[resistor-color-trio-exercie]: https://exercism.org/tracks/python/exercises/resistor-color-trio |