Electronic question, help me pleasee?

Question

1a] a mobile phone has a battery marked 3.6 volts, 300mAh. What does this mean? HOw much energy is stored in it?

b] if the talk time is 4 hours and the standby time is 120 hours, calculate the current drawn from the battery and the power supplied to the phone in each case.

c] whay is the talk time so much less than the standby time?

Working out pls :) xx

Answer 1

thats got nothing to do with the talktime/Ide time thats the wattage that the battery puts out.

b] if the talk time is 4 hours and the standby time is 120 hours, calculate the current drawn from the battery and the power supplied to the phone in each case.

120 / 4 hrs = 30hr SB to 1 TT or a\every hr talking = one less day TT, includes playing games or txting to a extent also



c] whay is the talk time so much less than the standby time?

Because when the cellphone is in stand by

it is not using its

-Built-in mike

-Built -in speaker

-Light is probably using like -5-10% power

-or camera if it has one for video conferencing

-Because of the Light difference txting and playing games etc drains power faster also

Answer 2

300mah is just a rating to compare different batteries.  A battery rated or 600mah will work approx twice as long (for the same voltage).

B doesn't matter to you unless you're an engineer designing a mobile phone.  As a consumer, there's nothng you can do to control or change what current or power is being used.

Talk time uses more power because the phone must transmit as well as receive.  Your Ipod can receive FM stations using only a single alkaline battery, but the FM stations has to send out thousands of watts of power to get that broadcast to your Ipod.  Transmission always uses MUCH more power than reception.