Ch 25: Current, Resistance, and EMF

Young & Freedman Calc - University Physics 14th Edition

Young & Freedman Calc14th EditionUniversity PhysicsISBN: 9780321973610Non è quello che usi tu?Cambia libro di testo

Young & Freedman Calc 14th Edition

Ch 25: Current, Resistance, and EMF

Problema 39b

Capitolo 25, Problema 39b

Consider the circuit of Fig. E25.30. What is the power output of the 16.0 V battery?

Guida verificata passo dopo passo

Identify the components in the circuit: The circuit consists of three batteries with voltages of 16.0 V, 13.5 V, and 7.5 V, and resistors with resistances of 2.2 Ω, 1.0 Ω, 8.0 Ω, and 6.0 Ω.

Apply Kirchhoff's loop rule: The sum of the potential differences (voltage) around any closed loop in a circuit must be zero. Write the equation for the loop considering the direction of current flow and the polarity of the batteries.

Calculate the total resistance in the circuit: Add up the resistances of the resistors in series to find the total resistance. The resistors are in series, so the total resistance R_total = 2.2 Ω + 1.0 Ω + 8.0 Ω + 6.0 Ω.

Determine the current in the circuit: Use Ohm's Law, V = IR, where V is the net voltage from the batteries, I is the current, and R is the total resistance. Solve for the current I.

Calculate the power output of the 16.0-V battery: Use the formula P = IV, where P is the power, I is the current calculated in the previous step, and V is the voltage of the 16.0-V battery.

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Ohm's Law

Ohm's Law is fundamental in circuit analysis, stating that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. It is expressed as V = IR, and is essential for calculating current in the circuit, which is needed to determine the power output of the battery.

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Percorso guidato

03:07

Resistance and Ohm's Law

Power in Electrical Circuits

Power in electrical circuits is the rate at which energy is transferred or converted. It is calculated using the formula P = VI, where P is power, V is voltage, and I is current. Understanding this concept is crucial for determining the power output of the battery, as it involves calculating the product of the battery's voltage and the current flowing through the circuit.

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Percorso guidato

06:18

Power in Circuits

Kirchhoff's Voltage Law

Kirchhoff's Voltage Law states that the sum of the electrical potential differences (voltage) around any closed network is zero. This principle is used to analyze the circuit by ensuring that the sum of the voltages provided by the batteries equals the sum of the voltage drops across the resistors, allowing for the calculation of current and subsequently the power output of the battery.

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Percorso guidato

04:08

Kirchhoff's Junction Rule

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