Circuits containing multiple elements Series and parallel combinations RC circuits

Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley.

• Circuits containing multiple elements

• Series and parallel combinations

• RC circuits

• Electricity in the nervous system

Chapter 23Circuits

Topics:

Sample question:

An electric eel can develop a potential difference of over 600 V. How do the cells of the electric eel’s body generate such a large potential difference?

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Reading Quiz 1. The bulbs in the circuit below are connected_________.

A. in seriesB. in parallel

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1. The bulbs in the circuit below are connected_________.

B. in parallel

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Answer


Reading Quiz 3. When three resistors are combined in series the total resistance

of the combination isA. greater than any of the individual resistance values.B. less than any of the individual resistance values.C. the average of the individual resistance values.

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3. When three resistors are combined in series the total resistance of the combination isA. greater than any of the individual resistance values.

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Answer


Drawing Circuit Diagrams

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Checking Understanding

The following circuit has a battery, two capacitors and a resistor.

Which of the following circuit diagrams is the best representation of the above circuit?

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The following circuit has a battery, two capacitors and a resistor.

Which of the following circuit diagrams is the best representation of the above circuit?

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Answer


Kirchhoff’s Laws

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Using Kirchhoff’s Laws

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The diagram below shows a segment of a circuit. What is the current in the 200 resistor?A. 0.5 AB. 1.0 AC. 1.5 AD. 2.0 AE. There is not enough information to decide.

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Ω

Clicker Question


The diagram below shows a segment of a circuit. What is the current in the 200 resistor?

B. 1.0 A

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Answer

Ω


The diagram below shows a circuit with two batteries and three resistors. What is the potential difference across the 200 resistor?

A. 2.0 VB. 3.0 VC. 4.5 VD. 7.5 VE. There is not enough information to decide.

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Ω

Clicker Question


The diagram below shows a circuit with two batteries and three resistors. What is the potential difference across the 200 resistor?

A. 2.0 V

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Answer

Ω


Series Resistors

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Parallel Resistors

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There is a current of 1.0 A in the circuit below. What is the resistance of the unknown circuit element?

What is the current out of the battery?

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Example Problem

1. In the circuit shown below, rank in order, from most to least bright, the brightness of bulbs A–E. Explain.

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Example Problem

2. In the circuit shown below:A. Rank in order, from most to least bright, the brightness of

bulbs A–D. Explain.B. Describe what, if anything, happens to the brightness of

bulbs A, B, and D if bulb C is removed from its socket. Explain.

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Example Problem

3. Compare the brightness of a 40 W bulb and a 25 W bulb• Which would be brighter in parallel?• Which would be brighter in series?

A. The 25 W bulbB. The 40 W bulbC. They are equally bright

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Analyzing Complex Circuits

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What is the equivalent resistance of the following circuit?

Find the current in and the potential difference across each element in the following circuit.

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Household Electricity

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The following devices are plugged in to outlets on the same 120 V circuit in a house. This circuit is protected with a 15 A circuit breaker.

Device PowerComputer 250 WHeater 900 WLamp 100 WStereo 120 W

Is there too much current in the circuit—does the circuit breaker blow?

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Circuits containing multiple elements Series and parallel combinations RC circuits

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