Consider this circuit with R1 = 30 ohm, R2 = 10 ohm, R3 = 10 ohm, R4 = 20 ohm, R
ID: 2273018 • Letter: C
Question
Consider this circuit with R1 = 30 ohm, R2 = 10 ohm, R3 = 10 ohm, R4 = 20 ohm, R5 = 60 ohm.
A. What is the equivalent resistance of the arrangement shown here?
B. What is the current across the resistor R2, if a voltage of 110 Volt is applied to
the two terminals at the bottom of the figure?
C. What is the voltage drop across R2?
D. Keep all other resistances at the same value, but allow R2 to vary. What are the
minimum and maximum resistances that this circuit can have?
Hint: Sketch how the overall resistance of the circuit depends on R2.
Consider this circuit with R1 = 30 ohm, R2 = 10 ohm, R3 = 10 ohm, R4 = 20 ohm, R5 = 60 ohm. What is the equivalent resistance of the arrangement shown here? What is the current across the resistor R2, if a voltage of 110 Volt is applied to the two terminals at the bottom of the figure? What is the voltage drop across R2? Keep all other resistances at the same value, but allow R2 to vary. What are the minimum and maximum resistances that this circuit can have?Explanation / Answer
R2 and R3 in series and the are in combine parrallel with R4, so we can easily get:
equivalent resistance = 100 ohm
net current in circuit
I = 110/100 = 1.1 A
divide the current in the R4 and R2 + R3, the resistance of both are equal so R4 will get .55A and R2 and R3 will get .55A
c) V = IR = 5.5 V
d) take R2 as zero and infinity and get equivalent resistance,
for R2 zero:
equivalent resistance = 96.66 ohm
for R2 infinity R2 and R3 both will be neglected as consider this as open branch
so, equivalent resistance = 110 ohm