Physics Practice Problems Kirchhoff's Loop Rule Practice Problems Solution: In the following figure, the configuration of resi...

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# Solution: In the following figure, the configuration of resistors is known as a Wheatstone Bridge, which is used to measure the resistance of an unknown resistor (let's say R1 in our case). This is accomplished by varying the resistance of one of the outside resistors (let's say R5 in our case) until the resistance through the center of the bridge is zero. For our bridge, the battery produces 20 V and the fixed resistances are R2 = 10 Ω, R3 = 20 Ω, and R4 = 30 Ω. If the current through the center of the bridges is zero, and the current produced by the battery is 1 A, when R5 reaches a value of 15 Ω, what is the unknown resistance?

###### Problem

In the following figure, the configuration of resistors is known as a Wheatstone Bridge, which is used to measure the resistance of an unknown resistor (let's say R1 in our case). This is accomplished by varying the resistance of one of the outside resistors (let's say R5 in our case) until the resistance through the center of the bridge is zero. For our bridge, the battery produces 20 V and the fixed resistances are R2 = 10 Ω, R3 = 20 Ω, and R4 = 30 Ω. If the current through the center of the bridges is zero, and the current produced by the battery is 1 A, when R5 reaches a value of 15 Ω, what is the unknown resistance?

Kirchhoff's Loop Rule

Kirchhoff's Loop Rule

#### Q. In the following circuit,V= 25 V, R 1 = 5 Ω, R2 = 15 Ω, R3 = 25 Ω, R4 = 10 Ω, and R5 = 20 Ω. Find each current in the circuit.

Solved • Thu Feb 23 2017 11:37:15 GMT-0500 (EST)

Kirchhoff's Loop Rule

#### Q. In the following circuit, the resistances are R 1 = 5 Ω, R2 = 10 Ω, R3 = 10 Ω, R4 = 25 Ω, and R5 = 15 Ω. If the current through R3 is 1 A to the right...

Solved • Thu Feb 23 2017 11:35:21 GMT-0500 (EST)

Kirchhoff's Loop Rule

#### Q. Consider the circuit shown in the sketch. The current in the 8.0 Ω resistor is   I1 = 3.0 A. What is the current through 4.0 Ω resistor?

Solved • Fri Jan 27 2017 13:59:02 GMT-0500 (EST)

Kirchhoff's Loop Rule

#### Q. Consider the circuit shown in the sketch. The current in the 8.0 Ω resistor is 2.0 A, in the direction shown. What is the resistance of the resistor ...

Solved • Fri Jan 27 2017 10:31:07 GMT-0500 (EST)