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resistor

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  1. 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...
  2. 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
  3. 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...
  4. i=p/u

    old bt phones, bring bring

    i have a load of old bt phones which the ends are in old gpo chock boxes, can i convert these onto new bt connectors (431a plugs).. any info on these be grand thanks. merry christmas and happy new year. and my new years resoloution is not to kurse on open forums.. sorry phillip;)
  5. sythai

    Resistor across a dimmer... help please

    Hi Chaps, Hope someone can help me with the following. Have got a couple of wall lights on a standard rocker switch at present, with 2 x low energy lamps. These come to less than 40watts in total. Customer want to put a dimmer in that is rated from from 40w - 300w. Sure I've heard before...
  6. R

    Fire alarm - what is this device it should be Resistor as its EOL on a call point -

    Testing a fire alarm panel today as we have to extend it to add some more smoke heads and call points.So prior to work had a look around and made sure zones were identified correctly and readings on circuits were as they should be.On one zone circuit I had a capacitor in the panel across the...
  7. M

    Resistor X

    ELLO ALL.. kinda stuck.... if anyone care to help me out? Q is..... two resistors of X ohms and 4 ohms are connacted in series to 20 V d.c supply. if the p.d across the X ohms is 4V, determine.... 1,the p.d across the 4 ohm resistor.. 2,the current taken by the supply.. 3,the value of...
  8. T

    test board resistors

    hi all, anyone have any idea what resistors colleges put in test boards to simulate longer cables for decent ring test results? cheers!
  9. E

    Need Help Working Out This Question!

    The Following resistors are connected in series to a 240v supply, 10ohm, 20ohm, 30ohm, calculate to power dissipated in the 10ohm resistor. How do i do this, and how would i do it for the 20ohm and the 30ohm resistor? Cheers Ed.
  10. D

    Dimmer buzzing

    Hi all quick question I recently installed 8 downlights 50w lamps low voltage. The problem is i'm getting a slight buzz at the fusebox when the dimmer is dimmed (400w dimmer) the breaker is a 10a wylex breaker tnc-s any suggestions would be great.
  11. S

    Resistor value ?

    I am trying to find the resistor value of Rx in this diagram, can someone please help.:confused:
  12. U

    I need a dimmer capable of dimming 1500W for 3 x Chandeliers.

    Hi Guys - I'm trying to find the best solution for this - It has been wired recently but the installed 1000w dimmer has blown. This is on a single metal back box. The dimmer controls 3 big chandeliers switched altogether. Total load of each chandelier is: 480w. Total load altogether is...
  13. B

    Help!! What variable resistor do i need?

    Hi, I need a little bit of help, i am going to wire a battery pack to a small electric motor, but i need to be able to control the speed of the motor. I know i need a variable resistor, but which one? I am really confused and need someone who has the knowledge to explain to me, what resistor i...
  14. B

    end of line resistor

    Hi all, I am installing a fire alarm, justrealised that for each zone and sounder circuit,there should be an end ofline resistor, cannnot find it in screwfix. what will happen if i dont use it? cheers in advance
  15. P

    resistor values

    resistor value software for i pod Resistor Color Code
  16. L

    1-10v dimmers

    has anyone got experence with installing these Apollo Lighting Ltd - DC/100 what cable should you use. I need to install four to supply four diffrent areas in a school class room, its a surface conduit job
  17. 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...
  18. H

    using voltmeter

    What will happen if we use a voltmeter to measure current in a circuit. I mean if we connect our voltmeter leads at different points on current carraying wire/coil?
  19. T

    How much power will a resistor rated at 1/2 w...?

    How much power (in mW) will a 680W resistor rated at ½ W dissipate when it conducts a current of 15 mA? Could you tell me how can you get the answer?
  20. G

    Fitting a brake resistor to a VSD

    Hello, i currently have a small project where i am required to fit a brake resistor to a vsd. i dnt no an awful lot on this subject. can anyone give me an explanation? cheers G

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