Series and Parallel Circuits

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Chapter 35 ELECTRIC CIRCUITS.

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Presentation transcript:

Series and Parallel Circuits Chapter 23 Notes Series and Parallel Circuits

Section 23.1 Objectives Differentiate between series and parallel circuits. Calculate currents, voltage drops, and equivalent resistances in series and parallel circuits.

Electric circuits Open circuit Closed circuit Short circuit

Series Circuits Equivalent resistance Current Voltage drops R = RA + RB + … Current I = Vsource/R Voltage drops

Example Problem Two resistors, 47.0 Ω and 82.0 Ω, are connected in series across a 45.0 V battery. What is the current in the circuit? What is the voltage drop across each resistor? If the 47.0 Ω resistor is replaced by a 39.0 Ω resistor, will the current increase, decrease, or remain the same? What is the new voltage drop across the 82.0 Ω resistor?

Parallel Circuits Equivalent resistance Current Voltage Ohm’s law 1/R = 1/RA + 1/RB + 1/RC + … Current Ohm’s law Voltage

Example Problem Three resistors, 60.0 Ω, 30.0 Ω, and 20.0 Ω, are connected in parallel across a 90.0 V battery. Find the current through each branch of the circuit. Find the equivalent resistance of the circuit. Find the current through the battery.

Section 23.2 Objectives Describe devices used to protect household wiring. Solve problems involving combined series and parallel circuits.

Safety Devices Short circuit Fuse Circuit breaker

Combined Series-Parallel Circuits

Problem-Solving Strategies

Example Problem A hair dryer with a resistance of 12.0 Ω and a lamp with a resistance of 125 Ω are connected in parallel to a 125 V source through a 1.5 Ω resistor in series. Find the current through the lamp when the hair dryer is on.