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Flashcards in Resistance Deck (8)
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1
Q

What is a ‘Light Dependent Resistor’?

A
  • A special type of resistor that changes its resistance depending on how much light there is
2
Q

What is seen with a light dependent resistor?

A
  • Bright light resistance falls

- Darkness resistance is highest

3
Q

What is seen with a thermistor?

A
  • In hot conditions, the resistance drops

- Cool conditions, the resistance increases

4
Q

What does a thermistor depend on?

A
  • The resistance depends on temperature
5
Q

Describe what happens when there is an electrical current in a resistor

A
  • There is an energy transfer which heats the resistor
6
Q

Why is there an energy transfer when there is an electrical current in a resistor?

A
  • Because of electrons colliding with ions with the lattice that makes up the resistor as they move through it
7
Q

What do the collisions do?

A
  • They give the ions in the lattice extra energy which is then emitted as heat
8
Q

Describe what the heat effect does

A
  • It increases the resistors resistance, which means less current will flow