LDR Applications and Function Quiz

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Questions and Answers

What is the primary function of an LDR?

  • To decrease light intensity by detecting light levels (correct)
  • To convert light into electrical energy for storage
  • To heat objects based on temperature changes
  • To increase light intensity when exposed to brightness

Which of the following is NOT a use of a thermistor?

  • Thermostat
  • Turning lights on in the dark (correct)
  • Digital thermometer
  • Heating

In which application would you find LDRs being used?

  • Controlling the speed of a motor
  • Monitoring temperature changes for heating systems
  • Adjusting the brightness of street lights automatically (correct)
  • Measuring voltage in electrical circuits

What type of sensor is a thermistor classified as?

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

What is a common use for LDRs in photography?

<p>Adjusting camera settings based on light levels (B)</p> Signup and view all the answers

What is the unit of potential difference?

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

What must be present for current to flow around a circuit?

<p>A potential difference (B)</p> Signup and view all the answers

What is the unit of current?

<p>Ampere (C)</p> Signup and view all the answers

In a single, closed loop circuit, how does the current behave?

<p>It has the same value everywhere (D)</p> Signup and view all the answers

What is resistance in an electrical circuit?

<p>Anything that opposes the flow of current (B)</p> Signup and view all the answers

Flashcards

LDR use

LDRs (Light Dependent Resistors) adjust resistance based on light intensity.

Thermistor use (heating)

Thermistors can be used in systems to control temperature.

Thermistor use (thermostat)

Thermistors help regulate temperature in thermostats.

LDR use (light meter)

LDRs measure light intensity.

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Thermistor use (digital thermometer)

Thermistors are used in devices to measure temperature digitally.

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What is resistance?

Resistance opposes the flow of electric charge in a circuit. It's like friction that slows down the flow.

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Potential difference

Potential difference, or voltage, is the driving force that pushes electric charges around a circuit. It's like the pressure difference that pushes water through a pipe.

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Unit of potential difference

The unit of potential difference is the volt (V).

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Unit of resistance

The unit of resistance is the ohm (Ω).

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Electric current

Electric current is the flow of electric charge in a circuit. It flows in a complete (closed) circuit due to a potential difference.

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Study Notes

LDR (Light Dependent Resistor) Function

  • An LDR uses light intensity to adjust resistance.
  • It decreases light intensity.

LDR Applications

  • Heating: Used in heating systems.
  • Thermostats: Used to control temperature.
  • Digital thermometers: Used to measure temperature digitally.
  • Turning lights on in the dark: Used in automatic lighting systems.
  • Light meters: Used to measure light levels.

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Related Documents

LDR Light Dependent Resistor PDF
Electric Current and Resistance PDF

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