why 75 v between r1 and r2

00:39:20

published 11 years ago

Belfagor

11 years ago

between r1 and r2 should be 50v not 75v... someone can explain this

urangkadai

11 years ago

V1= I. R1 so V1 would be 1.25=25v, so the rest of the voltage after decreased by 25ohm is 75v

QuangDuy

11 years ago

I=100/(25+50+25)=1A; U(r1)=1A*25=25V; 100-25=75V; U(r2)=1A*50=50V; 75-50=25V,......

QuangDuy

11 years ago

due to pressure drop across the resistor

Aristizabal95

11 years ago

v1= V*(r1/(r1+r2+r3))=100*(25/100)=25 voltage drop in the first resistor.

SWRDMaster

11 years ago

You have 100 volts and 100 ohms. So each ohm drops one volt. Starting at 100 volts you have a 25 ohm resistor (r1) that drops 25 volts leaving 75 volts between (r1,r2) and ground. The 50 ohm resistor (r2) drops 50 more volts leaving 25 volts between (r2,r3) and ground. The final 25 ohm resistor (r3) drops the final 25 volts leaving 0 volts between ground and ground (as expected).

Belfagor

11 years ago

thanks

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