An ohmmeter test across a short-circuited capacitor will consistently indicate a resistance of____________?
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Answer: D. zero
Explanation
A short-circuited capacitor provides a direct, zero-resistance metallic path between its terminals. When an ohmmeter is connected across this short, current flows freely without encountering insulation resistance. Consequently, the ohmmeter will consistently indicate a direct resistance reading of zero ohms. Short circuits occur when internal dielectric breakdown fuses the opposing conductive plates together. Ohmmeters measure component resistance by injecting a small test current and reading voltage drops. A healthy capacitor blocks direct current, whereas a shorted capacitor conducts current unimpeded.
Troubleshooting electronic circuits involves testing capacitors with ohmmeters to detect internal short circuits. Short-circuited filter capacitors can cause power supply fuses to blow immediately upon startup. Replacing damaged shorted capacitors restores normal circuit isolation and prevents further electrical damage. Option A suggests infinity, which describes an open circuit rather than a shorted capacitor. Option B suggests a few kilo-ohms, which indicates a leaky rather than fully short-circuited capacitor. Option C suggests a few megohms, characteristic of a healthy capacitor with high insulation resistance.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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