How transistor can be used as a switch?
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ᴛʀᴀɴsɪsᴛᴏʀ sᴡɪᴛᴄʜᴇs ᴄᴀɴ ʙᴇ ᴜsᴇᴅ ᴛᴏ sᴡɪᴛᴄʜ ᴀɴᴅ ᴄᴏɴᴛʀᴏʟ ʟᴀᴍᴘs, ʀᴇʟᴀʏs ᴏʀ ᴇᴠᴇɴ ᴍᴏᴛᴏʀs. ᴡʜᴇɴ ᴜsɪɴɢ ᴛʜᴇ ʙɪᴘᴏʟᴀʀ ᴛʀᴀɴsɪsᴛᴏʀ ᴀs ᴀ sᴡɪᴛᴄʜ ᴛʜᴇʏ ᴍᴜsᴛ ʙᴇ ᴇɪᴛʜᴇʀ “ғᴜʟʟʏ-ᴏғғ” ᴏʀ “ғᴜʟʟʏ-ᴏɴ”. ... ᴡʜᴇɴ ᴜsɪɴɢ ᴛʜᴇ ᴛʀᴀɴsɪsᴛᴏʀ ᴀs ᴀ sᴡɪᴛᴄʜ, ᴀ sᴍᴀʟʟ ʙᴀsᴇ ᴄᴜʀʀᴇɴᴛ ᴄᴏɴᴛʀᴏʟs ᴀ ᴍᴜᴄʜ ʟᴀʀɢᴇʀ ᴄᴏʟʟᴇᴄᴛᴏʀ ʟᴏᴀᴅ ᴄᴜʀʀᴇɴᴛ.
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Transistor switches can be used to switch and control lamps, relays or even motors. When using the bipolar transistor as a switch they must be either “fully-OFF” or “fully-ON”. ... When using the transistor as a switch, a small Base current controls a much larger Collector load current.
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