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Most ceramic capacitors use a numbering scheme similar to the resistor color code. Usually, three numbers are given.

The first two numbers are significant figures, and the third is the base 10 multiplier, or number of zeroes to add onto the end.

With ceramic capacitors, the value you get is typically assumed to be in picofarads (pF, 10-12 Farads). For much larger capacitors, the value is sometimes given in micro-Farads (uF, 10-6 Farads).

For example, for a capacitor marked "154":

1: First sig. fig

5: Second sig. fig

4: multiply by 104 (add 4 zeroes)

Result: 150,000 pF

Now, you can divide by one million to get an answer in uF, if that is more comfortable for you to work with:

150,000 pF = 0.15 uF

Therefore, a capacitor marked 154 has a value of 0.15 uF.

This should get you started reading ceramic capacitor values. For more detail, see the "coding" section of the wikipedia article on ceramic capacitors.

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Q: How do you read the value of a ceramic capacitor?
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