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Great question with capacitor

  1. Jul 18, 2015 #1
    I KNOW WHAT CAPACITOR IS. IT'S AN EQUIPMENT THAT SAVES ELECTRICAL ENERGY.
    MY QUESTION IS THIS:
    LET'S IMAGINE WE HAVE A CIRCUIT : BATTERY, A LIGHT, AND CAPACITOR. CURRENT FLOWS THROUGH ALL OF THEM. CAPACITOR IS TRYING TO SAVE ENERGY,ITS VOLTAGE IS INCREASING, AND FINALLY, WHEN IT'S FULLY CHARGED, A LIGHT gets switched off.
    then,when this all happened, question is why did we use capacitor? what did it help us with? maybe I didn't want light to be switched off, but let's say I wanted it, then looking at this condition, what am i gonna do with capacitor that has energy now?
     
  2. jcsd
  3. Jul 18, 2015 #2
    You wouldn't use a capacity in that circumstance.

    Imagine a different real world scenario. You want to generate a really bright flash for a camera, you need a load of energy to get the flash to the level you need, but you don't want to design something that requires really big batteries. What do you do? You build a circuit that charges up a capacity over a period of time (could be a few seconds, could be longer) using small batteries, and when you get a full charge, you release it from the capacitor into the flash circuit and get the voltage required to make your flash really flash!
     
  4. Jul 18, 2015 #3
    If you now remove the battery, and place a jumper in its place, the bulb will once again light for the same time. A useful energy store.
     
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