   Chapter 17, Problem 40P

Chapter
Section
Textbook Problem

A typical cell phone consumes an average of about 1.00 W of electrical power and operates on 3.80 V. (a) What average current does the phone draw from its battery? (b) Calculate the energy stored in a fully charged battery if the phone requires charging after 5.00 hours of use.

(a)

To determine
The average current drawn by phone from battery.

Explanation

Given Info: The power consumed by the phone is 1.00W . The voltage provided by battery is 3.80V .

Explanation:

Formula to calculate the average current is,

I=PΔV

• I is the average current drawn by the phone,
• P is the power consumed by phone,
• ΔV is the voltage provided by battery

Substitute 1.00W for P and 3

(b)

To determine
The energy stored in fully charged battery.

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