Autosave: 2023-02-10 09:49:28
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tags: [physics, electricity]
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---
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# Voltage
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## Difference of potential and the tranfer of energy
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We noted in the discussion of [current](/Electronics_and_Hardware/Analogue_circuits/Current.md) that current flows when there is a difference of potential between two points with negatively charged atoms at one point and positively charged atoms at the other.
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@ -68,6 +68,6 @@ When we use **double brackets** we are using _extended_ `test`.
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The extended test supports the standard `test` comparisons and adds other features:
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- The use of Boolean operators:
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```bash
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```
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[[ -d ~ || -a /bin/mash ]]; echo $?
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```
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