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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,

鈬�i=鈭�R1+R2i=12V(12+18)惟I=1230Ai=0.4A

The power dissipated in R1:

P1=i2R1P1=(0.4A)2脳12惟 P1=0.16A脳12惟P1=1.92W

The power dissipated in R2:

P2=i2R2P2=(0.4A)2脳18惟 P2=16A脳18惟P2=2.88W

03

Circuit diagram 

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Most popular questions from this chapter

What power is dissipated by the 2惟 resistor in figureCP28.78?

A battery is a voltage source, always providing the same potential difference regardless of the current. It is possible to make a current source that always provides the same current regardless of the potential difference. The circuit in FIGURE P28.56 is called a current divider. It sends a fraction of the source current to the load. Find an expression for Iloadin terms of R1,R2and Isource.You can assume that the load鈥檚 resistance is much less thanR2.

You鈥檝e made the finals of the Science Olympics! As one of your tasks, you鈥檙e given 1.0 g of aluminum and asked to make a wire, using all the aluminum, that will dissipate 7.5 W when connected to a 1.5 V battery. What length and diameter will you choose for your wire?

A 2.0mlong, 1mmdiameter wire has a variable resistivity given by

localid="1649324855366" 蚁(x)=2.5脳10-61+x1.02鈩�m

where x is measured from one end of the wire. What is the current if this wire is connected to the terminals of a 9.0Vbattery?

In FIGURE EX28.3, what is the magnitude of the current in the wire to the right of the junction? Does the charge in this wire flow to the right or to the left?
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