When, "while", "as" are conjunctions that connect two sentences. We use "when", "while", and "as" to talk about two things that happen at the same time.
"Could" is a modal verb used to express possibility or past ability as well as to make suggestions and requests. "Could" is also commonly used in conditional.
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A circuit wired in series is often used when you want to 'daisy chain' items. This type of circuit is sometimes referred to as 'current-coupled' because the.