For a device that drains 5 [mA] in idle mode and 80 [mA] is transmission mode, f

Question

For a device that drains 5 [mA] in idle mode and 80 [mA] is transmission mode, for the following battery technologies (arrange your results in a table):Calculate the maximum available talk time before the battery needs to be recharged. Calculate the battery lifetime, if the subscriber makes 1 call: (a) once a day, (b) every 6 hours, (c) every hour.The subscriber's call lasts 3 min but he leaves the phone on continuously.

* Note that you do not need to use this information to solve this problem

Zinc-Carbon Alkaline Li-FeS2 NiCd NiMH NiZn IEC/ANSI name R6/15D LR6/15A FR6/15LF KR6/1.2K2 HR6/1.2H2 -/- Capacity
(at 500mA drain*) 400-1000 [mA*h] 1800-2600 [mA*h] 2700-3400 [mA*h] 600-1000 [mA*h] 2200-2900 [mA*h] 1500-1800 [mA*h] Rechargable No No No Yes Yes Yes

Explanation / Answer

Hi, formula for the available talk time is

total battery capacity/ (((circuit load) + (active load x activation time)) x (average))

calculating for Zinc-carbon,

a) once per hour,
max=1000maH, circuit load= 5mA(since always on), active load=80mA,activation time=3/60=0.05,substituting
(1000) / ((5 + (80 x 0.05))

= (1000) / (5 + 4)

= (1000) / 9 = 111.1 Hours

b)every 6 hours

(1000) / ((5 + (80 x 0.05 x 4))

= (1000) / (5 + 16)

= (1000) / 21 = 47.61 Hours

c)every hour

(1000) / ((5 + (80 x 0.05 x 24))

= (1000) / (5 + 96)

= (1000) / 101 = 9.90 Hours
now, doing the same for others, we get

Thumbs up if this was helpful, otherwise let me know in comments.

option zinc-carbon alkaline Li-FeS2 NiCd NiMH NiZn a) 111.1 288.88 377.77 111.1 322.22 200 b) 47.61 123.08 161.9 47.61 138.09 85.71 c) 9.9 25.74 33.66 9.9 28.71 17.82

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