Opposes the flow of electric currents, which we measure in ohms, is indicated by a code of colours and numbers.
- Variable resistance.
The value of a variable resistance can be adjusted between zero and the maximum value specified by the manufacturer.
- Resistance that depends on a physical factor.
· Depends on temperature is called a thermistor:
Negative temperature coefficient (NTC): the resistance decreases.
Positive temperature coefficient (PTC): the resistance increases.
· LDR: the resistance varies according to the amount light received. Decreases as the amount of light increases.
- Capacitors.
Are components that can store an electrical change. The value of a capacitor indicates the change volts that it can store. This is measured in farads (F).
- Diodes.
It allows electric current flow in one direction. A diode has two electrodes: an anode (A) and a cathode (K).
A LED only gives off light when an electric current flows through it. Diode symbol:
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