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I know a transistor will let current flow under certain conditions and a switch only lets current flow if there is contact, but I dunno how to write it in clearer terms. Please help out, thanks!
And got the following answer:
A transistor is a semiconductor component which uses a small current to control the flow of a larger current. However, there is a limit to how large the current it can control. A switch is a large scale physical component that can be used to control the flow of a current. A switch must be physically opened or closed to regulate the flow of that large current. The important difference is that the current that a switch can control is significantly larger than the current a transistor can control. A very useful controller is a relay, which is effectively a switch that is thrown by energizing an electromagnet. When coupled with transistors (and some logic gates), the relay becomes a very useful component: a small current generated by a computer can be fed to the transistors. The transistors use that small current to determine when to let the (larger) current flow that energizes the electromagnet. When the electromagnet closes (opens) the switch in the relay, a very large current can flow (is stopped). In this way, the very small current produced as the signal from a computer can be used to control a VERY large current.
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