If we have E=3v and current I=0.15A and , we have four Resistors are R1=R2=R4 and R3=2R1 find : 1-total resistor ? 2-equivalent R1? 3-voltage in R3-R1?

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Answer 1 · 2017-12-19T12:23:51

Total resistance #=20 Omega#. The equivalent is #=5R_1 (R_1=4 Omega)#. Voltage drop across #R_1# is #=0.6V#. Voltage drop across #R_3# is #=1.2V#

The voltage is #U=3V#

The current is #I=0.15A#

Apply Ohm's Law

#U=RI#

The total resistor is

#R=U/I=3/0.15=20 Omega#

There are #4# resistors in the circuit

The sum is #R=R_1+R_1+2R_1+R_1=5R_1#

Therefore,

#5R_1=20#

#R_1=4 Omega#

The voltage drop across #R_1# is #=4*0.15=0.6V#

The voltage drop across #R_3# is #=8*0.15=1.2VV#