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utilizzare lo strumento di ritaglio delle immagini. nelle prime risposte non sono ben visualizzate. chiarire

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symbol for a resistor

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symbol for a variable resistor

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Symbol for a light dependent resistor.
its resistance decreases as a light is shone on it

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it is used in incubators because its resistance increases as temperature decreases. The temperature may also increase as a particular temperature range, and so can prevent over-heating

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this is a LDR graph, because, as the illumination increases, the resistance decreases. It is used with an algorithmical scale.

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When the LDR is is in darkness, the bell will be silent because the resistance is too high to allow electricity to pass.

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When the LDR is is in darkness, the bell will be silent because the resistance is too high to allow electricity to pass.

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As light is shone on the LRD, its resistance will decrease signicantly and will allow electricity to flow. Its passage generates a magnetic field, which attracts the a magnetic switch, and therefore the circuit is opened. Once circuit is opened, bell will ring