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SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS2 Marks
Question
Write down the difference between vacuum tube (valve) and semiconductors.
✓

Answer

 Vacuum tubeSemiconductor
1Devices and instruments made of vacuum tube are bulky in size.Devices/instruments made of semiconductor are comparatively small (compact) in size.
2They consume high power and operate at high voltages $(\sim 100 V$.)They consume low power and operate at low voltages.
3They have limited life and low reliability.They have long life and high reliability.
4Controlled flow of electrons is obtained by varying the voltage between its different electrodes.Controlled flow of electrons can be obtained by small applied voltage (or other simple excitations like light/ heat.)

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