How Does a Transistor Work?

What is the main function of a transistor in electronic devices?

• To generate light

• To store heat

• To control the flow of electric current

• To produce sound

Which statement best describes pure silicon?

• It is a good insulator, blocking all electric current.

• It is a perfect conductor, allowing electric current to flow freely.

• It is a semiconductor, conducting electricity better than insulators but not as well as metals.

• It is a gas at room temperature.

What happens when pure silicon is "doped" with an element like Phosphorus (which has 5 valence electrons)?

• It creates "holes" that act as positive charges.

• It adds extra electrons, increasing mobile negative charges.

• It makes the silicon a perfect insulator.

• It changes the silicon into a different element.

Are n-type and p-type semiconductors electrically charged?

• N-type is negatively charged, and p-type is positively charged.

• N-type is positively charged, and p-type is negatively charged.

• Both n-type and p-type semiconductors are electrically neutral.

• Their charge depends on the temperature.