Is polarity observed when installing an electrolytic capacitor in a circuit?

Is polarity observed when installing an electrolytic capacitor in a circuit?

• A. Yes
• B. No
• C. Sometimes
• D. Not necessary

Answer: (A)

Electrolytic capacitors are polarized components, meaning they have a defined positive and negative terminal and must be installed with the correct orientation. In a circuit, the positive lead should connect to the higher DC potential and the negative to the lower. This polarity matters because the electrolyte and oxide dielectric are formed on the anode side; applying reverse voltage can break down the dielectric, increase leakage, cause overheating, and even vent the capacitor. In DC designs, observe the marking on the part to align the positive and negative terminals with the circuit rails. If you’re dealing with AC or signals that swing polarity, use a non-polarized capacitor or two electrolytics connected back-to-back so the device can handle the alternating polarity.

Electrolytic capacitors are polarized components, meaning they have a defined positive and negative terminal and must be installed with the correct orientation. In a circuit, the positive lead should connect to the higher DC potential and the negative to the lower. This polarity matters because the electrolyte and oxide dielectric are formed on the anode side; applying reverse voltage can break down the dielectric, increase leakage, cause overheating, and even vent the capacitor.

In DC designs, observe the marking on the part to align the positive and negative terminals with the circuit rails. If you’re dealing with AC or signals that swing polarity, use a non-polarized capacitor or two electrolytics connected back-to-back so the device can handle the alternating polarity.