Thermistor Basics - NTC PTC

The video tutorial explains thermistors, which are resistors that change resistance with temperature. It covers two types: Positive Temperature Coefficient (PTC) and Negative Temperature Coefficient (NTC). PTC thermistors increase resistance with temperature, while NTC thermistors decrease resistance. The video also delves into atomic structure, explaining how electrons in different shells affect conductivity. It highlights the behavior of semiconductors, which can act as insulators or conductors based on temperature, due to the proximity of the conduction band to the valence shell.

What is the primary characteristic of a thermistor?

• It changes resistance with temperature.

• It changes color with temperature.

• It changes shape with temperature.

• It changes size with temperature.

How does the resistance of a PTC thermistor change with temperature?

• It decreases.

• It remains constant.

• It increases.

• It fluctuates randomly.

What is the role of the conduction band in a conductor?

• It prevents electrons from moving.

• It allows electrons to escape the atom.

• It holds the nucleus together.

• It stores energy for the atom.

Why can't electricity flow through an insulator?

• The outermost shell is full, and the conduction band is far away.

• Electrons have too much energy.

• The nucleus has a weak grip on electrons.

• The conduction band is too close.

What happens to a semiconductor's resistance as it is heated?

• It fluctuates.

• It decreases.

• It remains the same.

• It increases.