Question

The battery for a certain cell phone is rated at 3.70 V. According to the manufacturer it can produce 3.00×10^4J of electrical energy, enough for 7.20 h of operation, before needing to be recharged. Find the average current that this cell phone draws when turned on.

Answer 1

`I_(avg)=0.3135A`

Step-by-step explanation:

Given data

Voltage V=3.70V

time t=7.20h=25920s

Energy E=3.00×10⁴J

To find

Average current I

Solution

As we know that power is:

`Power=(Energy)/(y\time) \\Power=(3.00*10^(4)J )/(25920s)\\ Power=1.16W\\Also\\Power=V_(voltage)*I_(avg)\\ 1.16W=3.70V*I_(avg)\\I_(avg)=1.16/3.70\\I_(avg)=0.3135A`