Describe the important features of resistors diodes and ther

Describe the important features of resistors, diodes, and thermistors when used in a series DC circuit.

Solution

A resistor is not only a fundamental electronic component that can be used to convert a voltage to a current or a current to a voltage, but by correctly adjusting its value a different weighting can be placed onto the converted current and/or the voltage allowing it to be used in voltage reference circuits and applications.

A diode allows a current to flow through it in one direction only.Diodes are used in electric circuits to protect electrical equipment. In electrical equipment such as radio or computers damage can be caused if the battery is connected the wrong way round. A diode in the circuit only allows the current to pass through when the battery is connected correctly. If the battery is connected the wrong way round no current passes through the diode and the electrical circuit for the equipment is protected from damage.

A thermistor is an electrical component in which the resistance decreases as the temperature increases.It is this property of the thermistor that allows it to be used as a temperature sensor. A Thermistor can be used as an electronic thermometer in which the current flowing through it at different temperatures can be calibrated in degrees Celsius to give a temperature reading. A thermistor is also used in a fire alarm. A thermistor is placed into a fire alarm circuit such that above a set temperature the current through the thermistor is at an amount to trigger a relay circuit which rings an alarm.