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Chapter 28: Q. 8 (page 790)

How much power is dissipated by each resistor in FIGURE EX28.8?

Short Answer

Expert verified

P1=1.92WandP2=2.88W

Step by step solution

01

Given information

We need to find the power dissipation by each resistor.

02

simplify

Let us consider the current flowing be 'i':

Then,

⇒i=∈R1+R2i=12V(12+18)ΩI=1230Ai=0.4A

The power dissipated in R1:

P1=i2R1P1=(0.4A)2×12Ω P1=0.16A×12ΩP1=1.92W

The power dissipated in R2:

P2=i2R2P2=(0.4A)2×18Ω P2=16A×18ΩP2=2.88W

03

Circuit diagram 

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Most popular questions from this chapter

What are the emf and internal resistance of the battery in FIGURE P28.46?

a. What are the magnitude and direction of the current in the 18Ωresistor in FIGURE EX28.5?

b. Draw a graph of the potential as a function of the distance traveled through the circuit, traveling cw from V=0Vat the lower left corner.

Bulbs A and B in FIGURE Q28.12 are identical, and both are glowing. What happens to each bulb when the switch is closed? Does its brightness increase, stay the same, decrease, or go out? Explain

The switch in FIGURE EX28.36 has been in position a for a long time. It is changed to position b att=0 . What are the charge Qon the capacitor and the current Ithrough the resistor (a)immediately after the switch is closed? (b)att=50μs ? (c)at t=200μs?

The switch in FIGURE CP28.80 has been closed for a very long time.

a. What is the charge on the capacitor?

b. The switch is opened at t = 0 s. At what time has the charge on the capacitor decreased to 10% of its initial value?
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