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Help Level 3 Exam tom struggling

D

Danelec73

can anyone help please? Have an exam tom doing a few test papers at the moment could do with answers to a couple of questions.

Q1-If a resistance of 1.99Mohm is recorded on a final circuit,what action should i take?

Q2-If the Zs cannot be met,how might you get round the problem without installing bigger cables?

Q3- Why would PEFC and PSCC figure be the same in a TN-C-S install? and what does PScc stand for ?

And does anyone know which key on scientific calculator -6 -9 etc :mad:
 
calculator for 10 to the -6 would be ..........key in 10 then press 2ndF key (second function key) then the 10x key which is the "to the power of key" then the minus key which will be a little short minus in brackets like this (-) then 6, push the Enter/Answer button, this will give the answer as 0.00001, so for example 47 microfarads (47uF) capacitor would be " 47x10 to the minus 6 " farads using the calculator to get this would be 47 x 10 to the - 6 .......key in 47 then the multiply button (x) then the second function button (2NdF) then the 10x button and then the little minus button.....looks like this (-) then press 6......and hit enter which would give you 0.000047 Farads.

for 3 million, you would type in 3 times 10 to the six ( 3 key, multiply(X) key, second function key, 10x key then 6 key, hit enter) gives 3 million...

for 3 micro, you would type in 3 times 10 to the negative 6 (3 key, multiply (X) key, second function key, 10x key, then little minus key ...this one (-) followed by 6, hit Enter/Answer and that would give you 3 millionths (3 milli) etc...






Milli is X10 ....little minus (-) 3 ........this is common in voltages...

Micro is X10....little minus (-) 6........ this is a main one in Capacitors, etc

Nano is X10...little minus (-)9........common one for capacitor usage..

Pico is X10....little minus (-) 12.........although this is quite a rare one unless you are designing transmitter equipment...using tiny little ceramic capacitors etc...

Kil(o) as in Kilohms is X10 to the 3 ( type in number , second function key, X10 key then 3, Enter/Answer key)

Mega , as in Megohms is x 10 to the 6 (type in number, second function key, X10 key then 6, Enter/Answer key)



Kilo= Thousand

Micro= Millionths

Nano= Billionths

Pico= Trillionths


You will only need Mega , Micro and Nano

which is (2nd Function) X10...then press 6 (for Mega/Million)

Micro (remember its a little u with a long tail when you write it) which is (2nf Function) then press X10 then little minus (-) key then 6, Enter/Answer Key

and Nano which is (2nd Function) then press X10 then little minus (-) 9 Enter/Answer button..


just think of it in this order......BIG Megasaur Munches on Micro Nanny......BIG....SMALL....SMALLER.... no minus (-) key after X10.....minus key (-) 6 after X10 and minus key (-)9 after X10 to get micro and Nano...


Mega Dinosaur = Mega (times 10 to the 6)
Micro = well its micro :) (times 10 to the (-)minus 6)
poor old nanny = Nano (times 10 to the (-)minus 9)
 

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