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Electronics Basics: LEDs and Thermistors

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Electronics Basics: LEDs and Thermistors

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Questions and Answers

What is the process by which electrons in a semiconductor release energy in the form of photons?

Electromigration

Electroluminescence (correct)

Thermoelectricity

Electromagnetic induction

What is the characteristic of a PTC thermistor?

Resistance decreases with increase in temperature

Resistance remains constant with change in temperature

Resistance is inversely proportional to the square of temperature

Resistance increases with increase in temperature (correct)

What is the primary purpose of a jumper wire?

To increase the resistance of a circuit

To connect two points to each other without soldering (correct)

To measure the voltage of a circuit

To decrease the voltage of a circuit

What is the function of a potentiometer when only two terminals are used?

Variable resistor or rheostat Signup and view all the answers

What is the term for a temperature-dependent resistor?

Thermistor Signup and view all the answers

What is the standard 'host' connector type found on computers, hubs, or devices?

USB female Signup and view all the answers

What is the voltage range of the Vbus signal in a USB connector?

4.75 - 5.25 V Signup and view all the answers

What is the range of output voltage for the LM317T voltage regulator?

1.25 volts to just over 30 volts Signup and view all the answers

What is the main purpose of a buzzer or beeper?

To produce an audio signal Signup and view all the answers

What is the output voltage of the 7805 voltage regulator?

5V Signup and view all the answers