DAY 28

DC circuits

Slide 23-3

Slide 23-4

Slide 23-5

Drawing Circuit Diagrams

Slide 23-12

Checking UnderstandingThe following circuit has a battery, two capacitors and a resistor.

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

Slide 23-13

Answer 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?

A

Slide 23-14

Kirchhoff’s Junction Law

Slide 23-15

Kirchhoff’s Loop Law

Slide 23-16

Using Kirchhoff’s Laws

Slide 23-17

Series Resistors

Slide 23-22

Parallel Resistors

Slide 23-23

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?

Example Problems

Slide 23-24

What is the current supplied by the battery in the following circuit? What is the potential at each node? What is the current in each branch?

Example Problem

Slide 23-25

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

Example Problem

Slide 23-26

Example ProblemAs we saw in the previous chapter, a resistor connected to a power supply works as a heater. Suppose an investigator is using a resistor (a length of nichrome wire in an insulating sheath) connected to a battery to warm a solution in the laboratory. It’s a simple circuit:

A. What power does the resistor provide to warm the solution?

The investigator then decides that this warming is happening too slowly. She has another resistor, but doesn’t have another battery.

B. Which of the following circuits will provide more power? Slide 23-28

Electrical Safety

Analyzing Complex Circuits

Slide 23-29

WORKBOOKS 23.1-4QUESTIONS 1-4, 7,10,11,16,17

Capacitance and CapacitorsThe charge ±Q on each electrode is proportional to the potential difference ∆VC between the electrodes:

Slide 21-36

Charging a Capacitor

Slide 21-37

It requires energy to charge a capacitor. This energy is stored as electrical potential energy

The Capacitance of a Parallel-Plate Capacitor

Slide 21-38

Capacitor Combinations

Slide 23-30

Which of the following combinations of capacitors has the highest capacitance?

Checking Understanding

Slide 23-31

Answer Which of the following combinations of capacitors has the highest capacitance?

B

Slide 23-32

Which of the following combinations of capacitors has the lowest capacitance?

Checking Understanding

Slide 23-33

Answer

C

Which of the following combinations of capacitors has the lowest capacitance?

Slide 23-34

RC Circuits

Slide 23-35

The following circuits contain capacitors that are charged to 5.0 V. All of the switches are closed at the same time. After 1 second has passed, which capacitor has the highest voltage?

Checking Understanding

Slide 23-36

Answer The following circuits contain capacitors that are charged to 5.0 V. All of the switches are closed at the same time. After 1 second has passed, which capacitor has the highest voltage?

C

Slide 23-37

Electricity in the Nervous System

Slide 23-40

The action potentialDepolarization Repolarization Reestablishing resting potential

Saltatory Conduction

Slide 23-41

WORKBOOKS 23.5-7QUESTIONS 20, 23, 27

Summary

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Summary

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