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Chapter 21: Q35PE (page 776)

Apply the junction rule at point a in Figure 21.52.

Short Answer

Expert verified

Using the junction rule on point 'a', we obtained:

I3=I2+I1

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 junction rule

The sum of currents entering the junction equals the sum of currents leaving the junction, according to the junction rule. An equation may be written for point an in the figure 21.55 using the following rule:

I3=I2+I1

Hence current at location 'a' can be calculated using Kirchhoff's Junction rule as follows:

I3=I2+I1

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Most popular questions from this chapter

Electric fish generate current with biological cells called electro-plaques, which are physiological emf devices. The electro-plaques in the South American eel are arranged in \(140\) rows, each row stretching horizontally along the body and each containing \(5000\) electro-plaques. Each electro-plaque has an emf of \(0.15{\rm{ }}V\) and internal resistance of \(0.25{\rm{ }}\Omega \). If the water surrounding the fish has resistance of \(800{\rm{ }}\Omega \), how much current can the eel produce in water from near its head to near its tail?

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?

(a) What is the potential difference going from point \(a\) to point \(b\) in Figure \(21.47\)? (b) What is the potential difference going from \(c\)to \(b\)? (c) From \(e\) to\(g\)? (d) From \(e\) to \(d\)?

Why is the power dissipated by a closed switch, such as in Figure 21.43, small?

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