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WHAT ARE CAPACITORS? REVISION CARDS
V. Ryan © 2013
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INTRODUCTION - CAPACITORS
Capacitors are components that are used to store an electrical charge. They are often used in timer circuits. A capacitor may be used with a resistor to produce a timer. Timers are found in a large range of electronic devices
Sometimes capacitors are used to smooth the current in a circuit, as they can prevent false triggering of other components such as relays.
Electrolytic capacitors are ‘polarised’, which means they have a positive and negative lead and must be positioned in a circuit the right way round (the positive lead must go to the positive side of the circuit).
They have a much higher capacitance than non-electrolytic capacitors.
Non-electrolytic capacitors usually have a low capacitance compared to electrolytic capacitors.
They are not polarised (do not have a positive and negative lead) and can be placed anyway round in a circuit.
They are normally used to smooth the current (flow of electricity) in a circuit, so that the circuit works without faults occurring.
|1. In general, why are capacitors often found in circuits.? 3 marks|
|2. How do electrolytic and ceramic capacitors differ ? 4 marks|
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