Question

Assume a 1 Amp-hour battery is used on a cellular telephone. Also, assume that the cellular telephone draws 35 mA in idle mode and 250 mA during a call. How long would the phone work (i.e., what is the battery life) if the user leaves the phone on continually and has one 3-minute call every day? Every 6 hours? Every hour? What is the maximum talk time available on the cellular phone in this example? Compare this example to the technical specifications given for Nexus One smartphone. Find the average currents drawn by Nexium in talk time and standby time.

Answer 1

solution:  

Assume a 1 Amp-hour battery is used on a cellular telephone. Also, assume that the cellular telephone draws 35 mA in idle mode and 250 mA during a call. How long would the phone work.

Battery life formula is given as,

and

as given, battery - 1 Amp-hour

circuit load = 35 mA

active load = 250 mA

1)

For 3 - minute call everyday,

2)

For every 6 hours,

6 hours every, means 4 times activation time

  

  

3)

for every hour,

1.e. 24 times activation time

  

4)

For maximum available talk time on phone,