Week -2

In the above arrangement, when the switchh is closed the electromagnet receives electrical power from the battery and pulls the metal arm to hit the bell producing sound. 

Create a situation where the switch is closed for 2 seconds and then released. Observe the physical movement of the plunger. 

 2. Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions:

Temperature source: 20 °C from 0 to 10 seconds, 27 °C from 10 to 30 seconds, 23 °C from 30 to 50 seconds

Fan conditions: ON if the temperature above 25 °C, OFF otherwise

Expansion

A thermistor is a type of whose resistance is strongly dependent on temperature, more so than in standard resistors. The word thermistor is a portmanteau of thermal and resistor.

Thermistors are divided based on their conduction model. Negative Temperature Coefficient (NTC) thermistors have less resistance at higher temperatures, while Positive Temperature Coefficient (PTC) thermistors have more resistance at higher temperatures.Hence, a PTC thermistor's resistance is to temperature.

NTC thermistor are widely used as inrush current limiters, temperature sensors, while PTC thermistors are used as self-resetting overcurrent protection An operational temperature range of a thermistor is dependent on the probe type and is typically between −100 ⁰C and 300 ⁰C

signal builder : To create an interchangeable set of signal groups  Drag an instance of the Signal Builder block from the Simulink Sources library and drop it into your model. By default, the block represents a single signal group containing a

single signal source that outputs a square wave pulse. here we set signal as above mentioned change the time range from 10 to 50 secondsand chnge the y axis for 0 to 10 is 293k and for 10 to 30 is 300k and for 30 to 50 is 296k 

conclusion:

 So we can conclude that the amplitude is 0 if temperature below 298.15 k and amplitude 1 if temp is above 298.15 k in the output graph so the above conditon mentioned was satisfied.