Thermistor A transducer which converts temperature (heat) to resistance (an electrical property).
Earphone A transducer which converts electrical energy to sound.
Voltmeter Measures voltage. The proper name for voltage is potential difference but voltage is more widely used.
Transistor NPN A transistor amplifies current and can be used with other components to make an amplifier or switching circuit. This symbol is for a bipolar junction transistor (BJT), the type you are most likely to use at first.
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