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most capacitors will measure infinite resistance
starting capacitors are used to set up a rotating magnetic field by phase shifting a coil in a single phase motor
when the motor gets up to speed a centrifugal switch will disconnect the capacitor
this happens at a random time and can leave the capacitor with a charge easily 4x the applied ac voltage (+/-1,000V)
so some capacitors rated as starting capacitors will have an internal bleeding resistor
Gas discharge lamp ballast capacitors sometimes have discharge resistors.
Microwave ovens have capacitors usually in a voltage doubling configuration
(+/-20,000V) most have an internal bleeding resistor.
Never rely on this resistor being intact or even present.
It can have fatal consequences.
the internal resistors are sized to discharge the capacitors in tens of minutes
Tc = R * C ( seconds = ohms * farads )
What else can I help you with?
What is the differencebetween a run capacitor and start capacitor?
The run capacitor is used when the load is functional while the start capacitor is used to produce the initial torque to drive the load.
Can you change a 440 volt 12.5 uF start capacitor with a 370 volt 12.5uF run capacitor?
There are two ways to read this: you have a burned-out run capacitor on your motor and a good start capacitor in your parts box, and you have a burned-out start capacitor and a good run capacitor. If the run capacitor's bad and you want to put the higher-voltage start cap in its place, the answer is yes. This is called derating, and the only thing it does for you is increases the lifespan of the capacitor because you're not working it as hard as it can take. If the start capacitor's bad, don't do this--they used a 440-volt capacitor in there for a reason.
How do you differentiate a start capacitor from a run capacitor in air conditioner?
If the air conditioner has both, the run capacitor is likely the largest one. The start capacitor will only be in the circuit for a very short time, so overheating doesn't become an issue. The run capacitor must be sized for continual use.
Is a run capacitor the same as a start capacitor?
No, they are two different concepts. The start capacitor is used in conjuction with a starting winding on a single-phase induction motor to produce a small component of rotating field inside the motor. This ensures it rotates the desired way. The run capacitor is used to correct the power-factor of the motor, which reduces the current drawn from the supply for the same amount of power.
Do capacitors have internal resistance?
1. The capacitor has Lead resistance in series with the capacitor2. Since most capacitor use Dielectric and they have a leakage resistance and it is parallel to the Ideal Capacitor.
