Sensors and Transducers module quiz: LDR and thermistor, switch inputs, output transducers and the relay (O-Level Electronics) quiz
12questions. Pick an answer and you'll see why right away.
How does the resistance of a light-dependent resistor (LDR) change with light?
How does the resistance of a typical thermistor change as it gets hotter?
What is the purpose of a pull-down resistor with a push switch used as a logic input?
Which energy conversion does a loudspeaker perform?
Which energy conversion does an electric motor perform?
Why is a relay used to switch a mains-powered load from a low-voltage circuit?
Why is a flyback (protective) diode connected across a relay coil?
An LDR is placed at the bottom of a potential divider with a fixed resistor on top. As it gets darker, what happens to the output voltage taken across the LDR?
Which of these is an input transducer?
What does a potentiometer (variable resistor used as a divider) provide as an input?
Which output transducer converts electrical energy to light?
A thermistor is used to switch on a cooling fan when it gets hot. As the temperature rises, what does the thermistor resistance do?