Answered: mmon household electric current is…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter20: Induced Voltages And Inductance

Section: Chapter Questions

Problem 28P: An astronaut is connected to her spacecraft by a 25-m-long tether cord as she and the spacecraft...

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Question

ommon household electric current is called alternating current because the current alternates direction within the wires. The voltage V in a typical 115-volt outlet can be expressed by the function

V(t)=163sinωt,

where

is the angular speed (in radians per second) of the rotating generator at the electrical plant and t is the time measured in seconds. It is essential for electric generators to rotate at precisely 60 cycles per sec. Complete parts

(a)

and

(b).

(a)

How many times does the current oscillate in

0.05

sec?

time(s)

(b)

What are the maximum and minimum voltages in this outlet? Is the voltage always equal to 115 volts?

The maximum voltage is

nothing

V and the minimum voltage is

nothing

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