resistor

  1. gazdkw82

    Voltage drop - series resistors

    I have a question in a mock exam paper for the 202 exam. It asks "Four resistors in series have the voltage drops across them of 37V,55V,19V and 9V. Calculate the supply voltage. I'm struggling with how to approach this. I know how to work out VD but that requires more information (current)...
  2. dogsknob

    Homemade loop checkbox

    Hi to all, This is my first post, I thought I aught to contribute as I often dip in for the wealth of information and interesting debate, please excuse me if this is in the wrong place or already been done. I had a hour or 2 spare so with a handfull of bits from the van I've put together a...
  3. Simonslimline

    Series parallel combination resistance.

    Just spotted this on my facebook feed :juggle2: and thought it may be a good exercise for people to have a go at. What is the total resistance (Rt) of the circuit? :book::)
  4. uksparks

    Pyronix alarm triggers

    Hi, I have and regularly install Castle Enforcer alarms by Pyronix. i have a question and hoping someone may know. how can I trigger an input from a third party device, so for example how can I close a relay on another device or put a 12v feed in to an input on my alarm? i want to be able to...
  5. T

    Hi... need some help with this circuit connection

    Hi everyone. My name is Tim and I need some help. I am looking at a motorised pack I am using to clean windows. I want to add a variable resistor, I think they are called potentiometers. I am wondering though, where should I put it and what value should I get? I think maybe 100 OHM? Hope the...
  6. D

    Touch sensor light switch

    Firstly, I understand normal domestic electrics, but not electronics. I have a 240v 'capacitance touch sensor' light switch, see I LumoS Luxury Crystal Glass 1 Gang 1 Way Touch On/Off LED Light Switches | eBay The blurb states a minimum load of 3 watts. It works perfectly when used to switch...
    • Dannydee
    • Thread
    • glass light light switch resistor sensor switch touch
    • Replies: 2
    • Forum: DIY Electrical Advice
  7. H

    Resistor

    HI ALL DOES ANYONE KNOW WHAT SIZE RESISTOR I SHOULD USE FOR TESTING AA OR AAA ALKALINE BATTERIES ie Ohms and Watts WITH A MULTIMETER PLEASE
  8. T

    Can you work out the value of the resistor?

    Hi guys, Just wondering if you can help me on this one, I have a RLC series circuit the values are as below; R = unknown L = 800mH C = 300uF from there I have calculated; the resonant frequency to be 10.3Hz the capacitive reactance 51.50 ohms The reason I need to know is I need to work...
    • thepipersson198
    • Thread
    • access electrical work frequency impedance out resistor value
    • Replies: 4
    • Forum: UK Electrical Forum
  9. telectrix

    fluorescent dimmer...... help...

    not come across one of these before. it's dimming 2 x 1200 recessed florries.( 4 tubes each ). the actual dimmer switch has Lin and Lout, but also has 2 terminals + and - wired in telecom cable. ( so elv ). . don't know what's gone as lights don't work. tried a 1K dimmer, but then lights flicker...
  10. U

    MAF/IAT resistor mod ripoff HELP PLZ

    Hello, I have an important question regarding those ripoff MAF/IAT resistor mods. Long story short I bought into one without much research, idiotically, and installed it about two weeks ago. I put about 100 miles on the car, 2013 mazdaspeed 3, before I realized the acceleration was a little...
  11. W

    Who likes big resistor banks?

    Not really anything of much importance was just replacing a cutler & hammer resistor bank recently thought people may like a look. Motor can't remember entirely was around 75-100kw i think. I know of sort of how a resistor bank works, that its switched in series for start up to reduce current &...
  12. R

    techincal knowledge needed

    Hi am an electrician with the following dilemma. I've installed 9 dimmable led's on a led dimmer but the minimum load of the dimmer is 60 watts. The lamps are 4.5 watts and only have a total load of 40.5watts When I dim them down they do so far then they begin to flicker. But when i install a...
    • RichardMoore
    • Thread
    • dimmer going knowledge led needed power resistor standard
    • Replies: 15
    • Forum: UK Electrical Forum
  13. N

    Jcc led7 lighting

    Hi Guys, im after some advise. I'm currently completing a job where I have installed a vast amount of Jcc led7 Downlights. The client got trailing edge dimmers which I have found out are made by varilight. The have minimum wattage of 40 watts which in some rooms is causing the light to turn off...
    • NickJohnson
    • Thread
    • client jcc led lighting minimum resistor wattage
    • Replies: 1
    • Forum: UK Electrical Forum
  14. W

    What's that light called??

    Ok, bit of a silly one here, but what are the lights called where you span them from wall to wall with wire which is low voltage and have down lights along the wires? Trying to find them so any links would be great!
    • Wayne Gollop
    • Thread
    • called led light lights online resistor track what's
    • Replies: 12
    • Forum: UK Electrical Forum
  15. C

    wiring PIR to scantronic 9651PD

    Trying to fit a standard PIR using FSL conjnections method and cannot get the the resistance to change to 6K9 when PIR is activated! Can anyone help?
    • colfair
    • Thread
    • alarm check circuit pir resistor scantronic terminal wiring
    • Replies: 6
    • Forum: UK Electrical Forum
  16. Mark.W

    4 pole RCD

    Hi chaps Having quite a heated discussion with a colleague about a 4 pole RCD. He originally installed a 30mA RCD which now needs to be changed to a 100mA, however the N is on the opposite side. He seems to think that putting L1 into N of the RCD, L2 into L1, L3 into L2 and Neutral into L3...
  17. C

    LED 'Dummy Load'

    I'm having no end of issues with a current install. What I've got is two 3gang dimmer switches from Lightwave RF. Gang 1 - Auraled 240v 5w Warm White LED Dimmable Lamp x4 Gang 2 - Auraled 240v 5w Warm White LED Dimmable Lamp x6 Gang 3 - Auraled 240v 5w Warm White LED Dimmable Lamp x2 Gang 4 -...
  18. D

    Resistor Advice

    Greatings all! I'm really hoping that one of you kind people will advise me on this matter! I have been making a toy for my daughter and am struggling a little with what ohm resistor to use. So, I have two circuits boards that run off one 7.4V/ 1300 mAh battery. One circuit board is...
  19. A

    Find the Value of Resistor R Please

    So Im hear doing some homework and I cannot figure how to find the value of resistance r in both of these diagrams. Can someone show me the formula pls. You can click to enlarge them. Thanks. Diagram 1 Diagram 2
  20. B

    Working out resistor calculations...

    Late at night....tearing my hair out....need help with working out resistor calcs. 230V supply....R1=70...R2=90 What is the value of a resistor which when connected in parallel with 70 ohm resistor will cause a total current of 2.4 amps to flow in the circuit? any guidence to push me in the...
    • bilbo_88
    • Thread
    • aus calculations electrical work out parallel resistance resistor working
    • Replies: 7
    • Forum: Australia
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