capacitor | Page 5

capacitor

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  1. J

    Capacitor equation

    Can anyone help with this college equation? 3 x capacitors in parallel - 10pF (To the power of -12), 15 uF (-6), 25 nF (-9). What does Ct = ? Tutor says 10 (-6), I think 10 (-14). Thanks:confused:
  2. D

    capacitor sizing calculation

    does anyone know how to calculate capacitor sizes for capacitor start, capacitor run single phase motor? manufacturer info not available.
  3. L

    Urgent knoledge needed

    Can anyone help me out here I'm doing my 204 and it's asked me to explain why the supply current is reduced when the capacitor is in the circuit It also says when the choke voltage is added to the lamp voltage why does it not equal the supply voltage I've got about 5 lines to fill any...
  4. E

    Wiring a switch for 240v reversible capacitor start hoist

    I just bought a 2nd hand Leuropea HE200 electric hoist for a DIY project but the control switch is missing. The motor is a reversible 240v single phase with a capacitor start. I'm wondering how to wire it up? I have attached a circuit diagram I have draw up. I hope it is self-explanatory. My...
  5. M

    Designing a supercapacitor circuit

    hi, i'm given a project assignment of building a supercapacitor which can store roughly 700V to 1000V. Now i'm designing a circuit (discharging) which can help me light up a few LEDs using Voltage charge stored in the supercapacitor. The purpose of the circuit is to show that the...
  6. S

    capacitor

    Hi There , I wonder if any of you guys can explain to me why, in a flouriscent lighting (A.C )circuit with a choke and a capacitor connected , why does the supply current reduce when the capacitor is connected ,and why does the supply current increase when it is disconnected from the...
  7. cbw

    3 way switching and low energy bulbs

    There are low energy bulbs installed on a standard lighting circuit, there is 3 or 4 way switching using standard intermediate and 2 way switches, all tests ok with no deviation to regs. WHY do the low energy bulbs constantly pulse at about 40 pulses per minuite, it looks like they are trying...
  8. T

    RCD FCU randomly Trips ??

    Had a call out today to a bathroom fault. The bathroom has had a new light fitting and extractor fan, the electrician who had previously done the work had fitted a 30ma RCD FCU Above the bathroom door. since this has been done the tenants have said the rcd trips when they put the bathroom...
  9. P

    Discharging a Capacitor

    Want to test a capacitor with a Digital Multimeter butwant to take the right precautions beforehand. I've taken this PCB (is that the right term) that you can see in the pic from an old photocopier and want to mess around with components to familiarise myself with them. I'm not sure do i need to...
  10. J

    Why can't I just replace the capacitor and everything work again :(

    If only cap replacement worked every time, I was given good info that replacing the caps on power adapters and alarm consoles and the such would solve all my life's problems. And now that it doesn't I'm looking for the next micro-adjustment to save myself from putting in a whole brand new unit...
  11. S

    capacitor start motor

    For a single phase capacitor start motor, what will happen if we use a capacitor whose rating (capacitance uF) is lower or higher than the actual rating mentioned for that particular circuit?

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