help electrical question?

[zakovb]

i am still doing my city & guilds nearing finish ..i have a question if someone can be kind enough to help .

•A domestic system has given a total insulation resistance of 5M Ohm.

•The ring circuit up is 200 M Ohm
•Ring down is 140 M Ohm

•Lights are 16 M Ohm

•Cooker is 88M Ohm
•What is the resistance of shower?
​

 

[chrish_1977]

Is there more to the question?

 

[KAS1]

Just calculate resisters in parallel for your missing resistance simples

 

[KAS1]

He must of sorted it now lol

 

[KAS1]

The shower was from screwfix with a circuit resistance of 8.77 Mohms and the tiles in the shower room are 300mm x 300mm square black and white.

 

[jeffelectric]

8.78M ohm?

 

[Toonlad]

Resistance is Futile

 

[telectrix]

 

[zakovb]

yes thanks ..can some one show me hows its done mathematically.
1/200+1/140+1/16+1/88=1/0.08600649351
thus =11.627ohms
am i getting it wrong or missing something??

 

[telectrix]

1/200+1/140+1/16+1/88+1/R = 1/5. where R is the shower. answer in Mohms.

 

[Silly Sausage]

If there are about 100,000 5WWs (in the UK) assimilated into one unit, they would have nearly a 1000 years of training!

1/200+1/140+1/16+1/88+1/R = 1/5. where R is the shower. answer in Mohms.

That involves effort Tel, rearrange it so R = ........

 

[jeffelectric]

1/200+1/140+1/16+1/88= 0.08600649351 1/5=0.2
0.2-0.08600649351 =0.1139935 1/0.1139935065=

 

[KAS1]

reciprocals make life so easy

 

[telectrix]

find the common denominator and it becomes easy. even logical, as mr. spock would say.

 

[Guitarist]

If there are about 100,000 5WWs (in the UK) assimilated into one unit, they would have nearly a 1000 years of training!

So the senior members of this forum have as much training between them as 100,000 Electrical Trainee's Nice