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Chapter 21: Q36PE (page 776)

Apply the loop rule to loop abcdefghija in Figure 21.52.

Short Answer

Expert verified

The loop rule to loop abcdefghija is:

-I2R2+E1-r1I1-R5I1-r4I3-E4-r3I3+E3+R3I3=0

Step by step solution

01

Definition of Kirchhoff's law

Kirchhoff's first law defines currents at circuit junctions. It states that the sum of currents flowing into and out of a junction in an electrical circuit equals the sum of currents flowing out of the junction.

02

Explanation for the loop abcdefghija

An equation for loop abcdefghija in the Figure 21.52 can be found by applying the loop rule:

-I2R2+E1-r1I1-R5I1-r4I3-E4-r3I3+E3+R3I3=0

Sources acting in the same direction as the current flow are declared positive, whereas resistances and sources acting in the opposite direction are declared negative.

Therefore,the loop for abcdefghija is:

-I2R2+E1-r1I1-R5I1-r4I3-E4-r3I3+E3+R3I3=0

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Most popular questions from this chapter

Suppose you are doing a physics lab that asks you to put a resistor into a circuit, but all the resistors supplied have a larger resistance than the requested value. How would you connect the available resistances to attempt to get the smaller value asked for?

Apply the junction rule at point a in Figure 21.52.

Can all of the currents going into the junction in figure below be positive? Explain.

A switch has a variable resistance that is nearly zero when closed and extremely large when open, and it is placed in series with the device it controls. Explain the effect the switch in Figure 21.43 has on current when open and when close

To measure currents in Figure \({\rm{21}}{\rm{.49}}\), you would replace a wire between two points with an ammeter. Specify the points between which you would place an ammeter to measure the following: (a) the total current; (b) the current flowing through \({{\rm{R}}_{\rm{1}}}\); (c) through \({{\rm{R}}_{\rm{2}}}\) ; (d) through \({{\rm{R}}_{\rm{3}}}\) . Note that there may be more than one answer to each part.
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