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Does the physical size of a capacitor make a difference if the values are correct?
Wiki User
∙ 14y ago
The only criteria governing capacitor size is; will it fit into the space on the circuit board.
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Capacitors produce a reactance that is measured in ohms - depending on the alternating frequency of the current flowing through them - and that reactance will produce heat.
So, if you are designing equipment that will use a capacitor - or are replacing a defective capacitor - you must take into account how much energy it will produce as heat, that will have to be conducted away, otherwise the capacitor will burn up! So you must never use a capacitor that is physically too small for the job!
The answer given above needs is partially correct in that it should also say that, as long as it will fit into the space available, you can use a capacitor of the same microfarad value that is physically bigger than the one that you are replacing but you should never use one that is physically smaller.
It is also important to use the correct type of capacitor: it may not be safe to replace a non-electrolytic type by an electrolytic one, for instance.
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Not all capacitors are used in printed circuit boards. A capacitor used for motor starting also has to be matched exactly when replacing, as it also is engineer designed to the characteristics of the motor.
Wiki User
∙ 14y ago
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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.
In an electric motor can you replace a start capacitor with 300 MFD with one with 600 MFD?
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I assume that you are asking how to calculate the 'value' of a capacitor? Well, it depends what it is used for. If, for example, it is used to improve the power factor of a load, then it is first necessary to determine what the load's existing reactive power is; then, you need to know what reactive power is necessary with the power factor at its desired value; finally you need to difference between the actual and the desired values of reactive power -and this will be the necessary value for the capacitor. Power factor correction capacitors are rated in reactive volt amperes, not farads.
What are the capacitor effects on a single phase induction motor?
As anything to do with timing values for an electronic system of controlling a motor. Based on the question, the simple answer is that the capacitor causes a 90 degree lead which allows the motor to have a magnetic shift which causes the motor to start rotation.
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