3.4.2

Resistors & Diodes

Test yourself

Resistors and Diodes

Resistors and diodes are some of the more useful (and complex) circuit components.

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Resistors

  • Resistors: can limit the current flow at a fixed Amperage.
  • Variable resistors limit the current flow but can be adjusted.
  • A thermistor restricts current flow depending on the temperature.
    • In a fire alarm, the thermistor allows more current through to sound the alarm if the temperature of a room increases.
  • A light-dependent resistor (LDR) changes the amount of current flowing through a circuit with light levels.
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Diodes

  • A diode only allows current through in one direction.
  • A light-emitting diode (LED) lights up as a current flows through it.

Jump to other topics

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.5Plants & Photosynthesis

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.2Chemical Reactions

2.3Atoms, Elements, Compounds

2.4The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.7Energetics

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Thinking Scientifically

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