/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q21P Question: Four 18.0 鈩� resistor... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 27: Q21P (page 796)

Question: Four 18.0 鈩� resistors are connected in parallel across a 25.0 V ideal battery. What is the current through the battery?

Short Answer

Expert verified

Answer

The value of the current isI=5.56A .

Step by step solution

01

Write the given data:

  1. The value of each resistor isR=18.0惟
  2. The potential of the battery isV=25.0V
02

Determine the concept

Use the concept of Ohm鈥檚 law and the equivalent resistance of the parallel circuit. First, find the equivalent resistance and then, using that value in Ohm鈥檚 law formula, find the current through the battery.

Write the formula for the Ohm鈥檚 law and the equivalent resistance as:

V=IR1Req=1R1+1R2+1R3+1R4

03

Calculate the current through the battery  

First, calculate the equivalent resistance as follows:

1Req=118+118+118+118=4181Req=418Req=184Req=4.5惟

Using this value in Ohm鈥檚 law formula and solve as:

V=IRI=VRI=25.04.50I=5.56A

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

In Fig. 27-25, the ideal batteries have emfs 蔚1=12vand 蔚2=6.0v. What are (a) the current, the dissipation rate in (b) resistor 1?(4惟)And (c) resistor 2 (8惟), and the energy transfer rate in (d) battery 1 and (e) battery 2? Is energy being supplied or absorbed by (f) battery 1 and (g) battery 2?

When the lights of a car are switched on, an ammeter in series with them reads10.0 Aand a voltmeter connected across them reads12.0 V(Fig. 27-60). When the electric starting motor is turned on, the ammeter reading drops to8.00 Aand the lights dim somewhat. If the internal resistance of the battery is0.0500 ohmand that of the ammeter is negligible, what are (a) the emf of the battery and (b) the current through the starting motor when the lights are on?

In Fig. 27-48,R1=R2=10鈥�惟, and the ideal battery has emf.蔚=12V

(a) What value ofR3maximizes the rate at which the battery supplies energy and (b) what is that maximum rate?

Question: In Fig. 27-72, the ideal batteries have emfs,蔚1=20.0V,蔚2=10.0Vand蔚3=5.0V,, and, and the resistances are each200惟. What are the (a) size and (b) direction (left or right) of currenti1? (c) Does battery 1 supply or absorb energy, and (d) what is its power? (e) Does battery 2 supply or absorb energy, and (f) what is its power? (g) Does battery 3 supply or absorb energy, and (h) what is its power?

For each circuit in Fig. 27-20, are the resistors connected in series, in parallel, or neither?
See all solutions

Recommended explanations on Physics Textbooks

Classical Mechanics

Read Explanation

Torque and Rotational Motion

Read Explanation

Conservation of Energy and Momentum

Read Explanation

Quantum Physics

Read Explanation

Waves Physics

Read Explanation

Fundamentals of Physics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.