Capacitor hold charge even when disconnected from the supply, justify.
Answers
Answer:
Because capacitor have tendency to store the charges
Not just a ‘capacitor’, almost everything in this world can hold charge and act like a capacitor. So even a resistor holds some charge and acts like a capacitor, just that its not very good at it. Such undesired formation of capacitance in electronic components is commonly known as ‘parasitic capacitance’.
Not just a ‘capacitor’, almost everything in this world can hold charge and act like a capacitor. So even a resistor holds some charge and acts like a capacitor, just that its not very good at it. Such undesired formation of capacitance in electronic components is commonly known as ‘parasitic capacitance’.Now, for a ‘capacitor’ whose primary function IS to hold charge has to be very good at doing so. To improve the performance of this device at holding the charge, designers take into consideration the physics of how can maximum charge be crammed into minimum space so as not to make the component bulky. Hence it is safe to conclude that ‘capacitors’ that you see on a circuit board are components which can hold maximum charge for its size. As an analogy a tea cup and a saucer can both hold tea, but you require a lot many saucers to hold same amount of tea as a cup can hold.
Not just a ‘capacitor’, almost everything in this world can hold charge and act like a capacitor. So even a resistor holds some charge and acts like a capacitor, just that its not very good at it. Such undesired formation of capacitance in electronic components is commonly known as ‘parasitic capacitance’.Now, for a ‘capacitor’ whose primary function IS to hold charge has to be very good at doing so. To improve the performance of this device at holding the charge, designers take into consideration the physics of how can maximum charge be crammed into minimum space so as not to make the component bulky. Hence it is safe to conclude that ‘capacitors’ that you see on a circuit board are components which can hold maximum charge for its size. As an analogy a tea cup and a saucer can both hold tea, but you require a lot many saucers to hold same amount of tea as a cup can hold.To give you an example, your body itself is as good a capacitor as a 4mm diameter ceramic capacitor. So the capacitive ability of your body has been equivalently squashed into such a small size by playing around with the dielectric, electrode material, shape and size.