Conceptual Physics

(a) V

(b) V

(c) V

Section 7 - Interactive problem: series wiring

7.1 Use the simulation in the interactive problem in this section to calculate the resistance of the R 2 bulb.

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Section 10 - Resistors in parallel

10.1 The four heating elements on an electric stove are wired in parallel so that any combination of them can be on at the same

time. When an element is on, it behaves as a 6.70 ȍ resistor. When all of the heating elements are on, what is the equivalent

resistance of the stove?

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10.2 A 6.00 ȍ and 42.0 ȍ resistor are in parallel. What is their equivalent resistance?

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10.3 Forty 7.00 ȍ resistors are in parallel. What is their equivalent resistance?

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10.4 The potential difference across points C and

D is 9.2 V. The current flowing past C is 4.6 A.

The two resistors are identical. (a) What is the

resistance of each one? (b) What is their

equivalent resistance?

(a) ȍ

(b) ȍ

10.5 This circuit, called a Wheatstone bridge, is

useful for making precise resistance

measurements. The potential difference

measured by the voltmeter in the middle

depends on the relative resistances of the

four resistors. If that potential difference is

zero, the Wheatstone bridge is said to be

balanced. Suppose you balance the

Wheatstone bridge in the figure by adjusting

the variable resistor to 51.0 ohms. What is the

resistance of R 1? (Hint: Because the bridge is

balanced, the potential difference across R 1 equals that across R 2. The same relation holds between Rvariable and R 3 .)

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10.6 You have access to many 12.5 ȍ and 50.0 ȍ resistors. (a) How can you create a 62.5 ȍ equivalent resistor? (b) A 10.0 ȍ

equivalent resistor? (c) A 60.0 ȍ equivalent resistor?

(a)

(b)

(c)

10.7 What is the equivalent resistance of the circuit

shown?

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(^502) Copyright 2007 Kinetic Books Co. Chapter 27 Problems