Hi all,
Just a quick question. If you have an earth which is 0v and a closed circuit, then connect it in a closed circuit between the positive end of a 240v cell and resistor i take it you will have get a P.D of 240v. However if you connect the same earth at the negative end of the cell, will there still be a P.D? Will it possibly be 240v/0v?
Quick diagram:
Or is it that the p.d across "- to E" fluctuates depending on what is turned on in the circuit? Basically all this stems from the fact that i have a neutral wire and i used two 100v-250v mains testers on it (screwdriver with neon light). One very dimly lit up and one didnt light up at all. I was a bit worried that it had lit one so i checked the voltage across this wire to the neutral of another point and there was a p.d of 50v? I really should have checked the p.d of that neutral to earth instead now thinking about it ! Im thinking this negative is connected at a junction box somwhere with shared neutral connections of other circuits; is this a likely/feasible reason?
Thanks for any help!
Just a quick question. If you have an earth which is 0v and a closed circuit, then connect it in a closed circuit between the positive end of a 240v cell and resistor i take it you will have get a P.D of 240v. However if you connect the same earth at the negative end of the cell, will there still be a P.D? Will it possibly be 240v/0v?
Quick diagram:
Or is it that the p.d across "- to E" fluctuates depending on what is turned on in the circuit? Basically all this stems from the fact that i have a neutral wire and i used two 100v-250v mains testers on it (screwdriver with neon light). One very dimly lit up and one didnt light up at all. I was a bit worried that it had lit one so i checked the voltage across this wire to the neutral of another point and there was a p.d of 50v? I really should have checked the p.d of that neutral to earth instead now thinking about it ! Im thinking this negative is connected at a junction box somwhere with shared neutral connections of other circuits; is this a likely/feasible reason?
Thanks for any help!