A circuit is constructed with six resistors and two batteries as shown. The battery voltages are V 1 = 18 V and V2 = 12 V. The positive terminals are indicated with a + sign, The values for the resistors are: R 1 = R5 = 61 Ω, R2 = R6 = 141 Ω R3 = 50 Ω, and R4 = 135 Ω. The positive directions for the currents I1, I2 and I3 are indicated by the directions of the arrows.
1) What is V4, the magnitude of the voltage across the resistor R4?
V4=(12 V)(135 Ω)/(135+61)Ω = 8.26 V
2) What is I3, the current that flows through the resistor R3? A positive value for the current is defined to be in the direction of the arrow
I3=(61Ω)/((61)(50)+(61+50)(141+141))ΩΩ (12 V-18 V(1+(141+141)/61)Ω) = -.158 A
3) What is I2, the current that flows through the resistor R2? A positive value for the current is defined to be in the direction of the arrow.
I2=18 V/61 Ω + (-.158 A)(61+50)Ω/61 Ω =.007 A 4) What is I1, the current that flows through the resistor R1? A positive value for the current is defined to be in the direction of the arrow.
I1=.0068 A – (-.158 A)= .165 A 5) What is V(a) – V(b), the potential difference between the points a and b?
V(a)-V(b)=(.0068 A)(141Ω)=.9588 V
A circuit is constructed with five resistors and one real battery as shown above right. We model. The real battery as an ideal emf V = 12 V in series with an internal resistance r as shown above left. The values for the resistors are: R1 = R3 = 57 Ω, R4 = R5 = 103 Ω and R2 = 108 Ω. The measured voltage across the terminals of the batery is Vbattery = 11.75 V.
1) What is I1, the current that flows through the resistor R1?
And R345=R3+R4+R5=263 Ω Requiv=57 Ω + (108Ω *263Ω)/(108+263)Ω =133.56Ω I1=11.75 V/133.56 Ω = 87.97mA (note the m prefix!) 2) What is r, the internal resistance of the battery?
R=133.56 Ω (12-11.75)V/12V = 2.8 Ω
3) What is I3, the current through resistor R3?
I3=(11.75V-.087A(57Ω))/263 Ω = 25.6 mA
4) What is P2, the power dissipated in resistor R2?
P2=(.0256 A*263Ω)^2/108 Ω=.420 W
5) What is V2, the magnitude of the voltage across the resistor R2?
V2=.0256 A * 263 Ω = 6.73 V 6)
Resistor R2 is now shorted out as shown. How does the magnitude of the voltage across the battery change? Right Answer: 1 Feedback: Your answer is correct! Shorting R2 changes the equivalent resistance of the circuit. In particular, shorting R2decreases the equivalent resistance of the circuit. Therefore, more current will be drawn, causing the voltage drop across the internal resistance to increase, which, in turn, causes the voltage seen across the terminals of the battery to decrease!
A circuit is constructed with six resistors and two batteries as ... - GitHub
A circuit is constructed with six resistors and two batteries as shown. The battery voltages are V1 = 18 V and V2 = 12 V. The positive terminals are indicated with ...
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