resistors

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  1. S

    what resistors needed for 24 volt switches

    Im trying to make a Star Wars Prop for a course project where the dealine is comming up very fast in days and I need to do the report so really urgent On the prop whihc is a portable control box Dual control box (Left side control panel, a tower in the middle and a right side control panel On...
  2. timhoward

    All about resistors...

    I've managed to mainly fix a Megger 1502 MFT that was so far out of calibration it got laughed out of a tester day. I have high current loop. rcd test currents, and low resistance within spec now. (I can share more info about this process separately if anyone's interested, it's been an...
  3. M

    Calculation of resistors for premagnetizing a transformer

    Existing situation: 3150kVA transformer, 11kV/450V no load losses 6300W. Existing premagnetizing resistors with power losses 322kW for 5s. Due to increase in power demand, a new transformer has to be installed: 11kV/470V no load losses 8500W. Would the above mentioned resistors be enough? And...
    • Marcopolo
    • Thread
    • calculation resistors transformer
    • Replies: 1
    • Forum: UK Electrical Forum
  4. H

    am i correct in saying that in voltage follower/buffer circuit if there are no resistors present then there is no gain?

    • Hamzah712
    • Thread
    • circuit correct electrical electronic engineering present resistors saying voltage
    • Replies: 5
    • Forum: UK Electrical Forum
  5. B

    EOL resistors

    Im not massively experienced in fire alarms... But can you use one end of line resistor on a different brand of circuit? Currently we're using a kentech board and only have esp resistors to hand? Can I use those. I presume they are no different to any other brand.
  6. gazdkw82

    Missing resistors

    for some reason I'm struggling with resistors more than anything else in the electrical science (202/203) course material. I have a table with 6 examples, each having 3 resistors in parallel and a total resistance. Problem is a lot of the figures are missing and the question asks to find the...
  7. 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)...
  8. gazdkw82

    Parallel resistors

    I'm getting conflicting information regarding parallel resistors. I originally thought the below was how to calculate total parallel resistance 1. Rt= 1/R1+1/R2+1/R3 2. 1/Rt However in my pre exam workbook it says to 1. Calculate Rt as 1. above 2. Find the lowest common denominator 3...
  9. S

    Checking loop tester readings from a sample socket.

    After calibration of my loop tester,I am considering using a socket in the house for future calibration checks and to connect various low resistances in series with earth via a rotary switch to give a range of readings,and if so what value of resistors?Thanks for any advice...
  10. D

    honeywell g2 and activ8

    Evening all, I think I am being thick but I cant fathom out how to wire activ8 sensors into the g2, I will admit I have never wired one, have been fitting accentas since forever but I cant find an idiots wiring diagram for the panels, I downloaded the 137 page manual and I have the activ8...
  11. HappyHippyDad

    Leds and capacitance...

    There are always quite a few threads where the problem is the LED staying on slightly even when switched off and I see that the solution is to fit certain resistors as a snubber. I have never had this problem. I guess I have either been lucky or have found a combination of switches/lamps that...
  12. dlt27

    Glowing Led Chandelier.

    Hi I know something similar has been posted before, but can't find it. I have fitted a varilight eclique dimmer with a chandelier that has gu10 dimmable megaman leds. When the switch is turned off the led's continue to glow. Am I right in thinking the problem is that induced voltage from the...
  13. A

    Simple Question about LEDS and Resistors

    First off, I want to say that I'm not an electrician and don't know much about electricity. My question... Is it ok to have two resistors connected to a 3mm led? Please don't ask why two resistors. I just want to know if it would harm the led or have any kind of negative effect on the circuit...
    • Ajaylat
    • Thread
    • attach battery led leds question resistors simple
    • Replies: 15
    • Forum: DIY Electrical Advice
  14. M

    Resistors In Series-Parallel

    Me again folks After Sintra helping me out yesterday i've stumbled across another problem. I've attached the problem if anyone can help or guide me in the right direction i'll know how to work these out in the future. Thanks in advance folks. Mark
  15. M

    Resistors in Parallel Help

    Hi All first post. I'm currently doing a Pre Entry in Electrical Engineering and really enjoying it so far. My question is i'm finding the Resistors in Parallel a bit tricky see below. The question asks me to determine the values of V,I2,I3 and R Suppose i'm more confused in whats best to...
  16. M

    Series and parallel

    Can someone just please clarify I have the correct understanding here. With a series circuit with two resistors in it the voltage from the source is dropped equally over the loads and reduced to mV on the outgoing side. Now if you tap into it before it hits those resistors you have created a...
    • Monkeyblaine
    • Thread
    • circuit parallel resistors series voltage
    • Replies: 27
    • Forum: UK Electrical Forum
  17. D Skelton

    Maths - Resistors in series and parallel: Beginner

    Maths - Resistors in series and parallel: Beginner
  18. D Skelton

    Maths - Resistors in series and parallel: Intermediate

    Maths - Resistors in series and parallel: Intermediate
  19. D Skelton

    Maths - Resistors in series and parallel: Advanced

    Maths - Resistors in series and parallel: Advanced
  20. 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 -...

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