Domanda del libro di testo
(a) What is the current in the 13-Ω heating element of a 240-V clothes dryer?
(b) How much charge passes through the element in 15 min? (Assume direct current.)
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Ch. 25 - Electric Current and Resistance
Giancoli Douglas5th editionPhysics for Scientists and EngineersISBN: 9780137488179
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TOC.tableOfContents
- Ch. 01 - Introduction, Measurement, Estimating10
- Ch. 02 - Describing Motion: Kinematics in One Dimension30
- Ch. 03 - Kinematics in Two or Three Dimensions; Vectors15
- Ch. 04 - Dynamics: Newton's Laws of Motion16
- Ch. 05 - Using Newton's Laws: Friction, Circular Motion, Drag Forces22
- Ch. 06 - Gravitation and Newton's Synthesis10
- Ch. 07 - Work and Energy21
- Ch. 08 - Conservation of Energy33
- Ch. 09 - Linear Momentum26
- Ch. 10 - Rotational Motion41
- Ch. 11 - Angular Momentum; General Rotation27
- Ch. 12 - Static Equilibrium; Elasticity and Fracture27
- Ch. 13 - Fluids28
- Ch. 14 - Oscillations14
- Ch. 15 - Wave Motion35
- Ch. 16 - Sound5
- Ch. 17 - Temperature, Thermal Expansion, and the Ideal Gas Law40
- Ch. 18 - Kinetic Theory of Gases18
- Ch. 19 - Heat and the First Law of Thermodynamics31
- Ch. 20 - Second Law of Thermodynamics32
- Ch. 21 - Electric Charge and Electric Field7
- Ch. 23 - Electric Potential20
- Ch. 24 - Capacitance, Dielectrics, Electric Energy, Storage15
- Ch. 25 - Electric Current and Resistance32
- Ch. 26 - DC Circuits22
- Ch. 27 - Magnetism21
- Ch. 28 - Sources of Magnetic Field24
- Ch. 29 - Electromagnetic Induction and Faraday's Law21
- Ch. 30 - Inductance, Electromagnetic Oscillations, and AC Circuits42
- Ch. 31 - Maxwell's Equations and Electromagnetic Waves25
- Ch. 32 - Light: Reflection and Refraction42
- Ch. 33 - Lenses and Optical Instruments21
- Ch. 34 - The Wave Nature of Light: Interference and Polarization26
- Ch. 35 - Diffraction24
- Ch. 36 - The Special Theory of Relativity29
- Ch. 38 - Quantum Mechanics1
- Ch. 40 - Molecules and Solids6
- Ch. 43 - Elementary Particles3
- Ch. 44 - Astrophysics and Cosmology9
Giancoli Douglas5th editionPhysics for Scientists and EngineersISBN: 9780137488179Non è quello che usi tu?Cambia libro di testo
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Giancoli Douglas 5th editionCh. 25 - Electric Current and ResistanceProblema 1
Giancoli Douglas 5th editionCh. 25 - Electric Current and ResistanceProblema 1Capitolo 24, Problema 1
What voltage will produce 0.25 A of current through a 5400-Ω resistor?
Guida verificata passo dopo passo1
Identify the relationship between voltage, current, and resistance using Ohm's Law: \( V = I \cdot R \), where \( V \) is the voltage, \( I \) is the current, and \( R \) is the resistance.
Substitute the given values into the formula: \( I = 0.25 \; \text{A} \) and \( R = 5400 \; \Omega \). The equation becomes \( V = 0.25 \cdot 5400 \).
Perform the multiplication to calculate the voltage. This step involves multiplying the current (in amperes) by the resistance (in ohms).
Ensure the units are consistent: amperes for current, ohms for resistance, and volts for voltage. The result will be in volts.
The calculated voltage represents the potential difference required to produce the given current through the resistor.
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Ohm's Law
Ohm's Law is a fundamental principle in electronics that relates voltage (V), current (I), and resistance (R) in a circuit. It states that V = I × R, meaning the voltage across a resistor is equal to the product of the current flowing through it and the resistance. This law is essential for calculating the voltage required to achieve a specific current in a resistor.
Video consigliato:
Percorso guidato
03:07
Resistance and Ohm's Law
Resistance
Resistance is a measure of the opposition to the flow of electric current in a conductor. It is measured in ohms (Ω) and depends on the material, length, and cross-sectional area of the conductor. In the context of the question, the 5400-Ω resistor indicates how much it resists the flow of current, which directly affects the voltage needed to achieve a certain current.
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Percorso guidato
05:25Resistivity & Resistors in Circuits
Current
Current is the flow of electric charge in a circuit, measured in amperes (A). It represents the rate at which charge is flowing through a conductor. In this question, a current of 0.25 A is specified, and understanding how current interacts with voltage and resistance is crucial for determining the necessary voltage to achieve this current through the given resistor.
Video consigliato:
Percorso guidato
05:38Intro to Current
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