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?

<p>Variable resistor or rheostat (D)</p> Signup and view all the answers

What is the term for a temperature-dependent resistor?

<p>Thermistor (B)</p> Signup and view all the answers

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

<p>USB female (B)</p> Signup and view all the answers

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

<p>4.75 - 5.25 V (D)</p> Signup and view all the answers

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

<p>1.25 volts to just over 30 volts (C)</p> Signup and view all the answers

What is the main purpose of a buzzer or beeper?

<p>To produce an audio signal (B)</p> Signup and view all the answers

What is the output voltage of the 7805 voltage regulator?

<p>5V (D)</p> Signup and view all the answers

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