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Transitors

Transitors. Light sensitive switch. How it works. LDR When the LDR is put in the dark the bulb lights up Automatics lights at night. Time delay switch. How it works. The capacitor charges up slowly

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Transitors

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Presentation Transcript

  1. Transitors

  2. Light sensitive switch

  3. How it works • LDR • When the LDR is put in the dark the bulb lights up • Automatics lights at night

  4. Time delay switch

  5. How it works • The capacitor charges up slowly • It is several seconds before the voltage across it is high enough to switch the transistor on • The switch next to the capacitor when closed causes the capacitor to discharge • More capacitance – more delay

  6. Temperature sensitive switch • Resistance falls when temperature increases • Part of a potential divider circuit • At low temp the thermistor has high resistance • At high temp the thermistor has a low voltage • The transistor is switched on

  7. Temperature switch

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