Understanding Thermistors and Heat Operated Switches

What is the primary function of replacing an LDR with a thermistor in a heat-operated switch?

• To make the switch sensitive to pressure

• To make the switch sensitive to light

• To make the switch sensitive to heat

• To make the switch sensitive to sound

Which type of thermistor increases its resistance as the temperature rises?

• Positive Temperature Coefficient (PTC)

• Negative Temperature Coefficient (NTC)

• Light Dependent Resistor (LDR)

• Variable Resistor

In most practical applications, which type of thermistor is commonly used?

• VDR

• LDR

• NTC

• PTC

What happens to the resistance of an NTC thermistor when the temperature increases?

• The resistance increases

• The resistance decreases

• The resistance fluctuates

• The resistance remains constant

In a fire alarm system using an NTC thermistor, what effect does a decrease in resistance have on the base voltage?

• The base voltage fluctuates

• The base voltage increases

• The base voltage remains the same

• The base voltage decreases