# Calculation of Power

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• Published : February 19, 2012

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POWER CALCULATION
Power is the quantity work has to do with a force causing a displacement. It is the rate at which work is done. (http://www.physicsclassroom.com/class/energy/u5l1e.cfm) We can calculate power with using the following equation.

In this experiment I calculated my power with
Power (watt)=mass (kg) *gravitational acceleration (m/s2)*height(m)/time (s) I made the experiment with my controller for getting more reliable datas.I calculated my power with cliambing upstairs and meausuring its’ time.I did this 5 times to get more data. While I was climbing, my controller measure the time with a chronometer. To find my mass I used electronic balance and to find the height of stairs I used a ruler. I found the literal value of gravitational acceleration 112.64

213.89
312.38
413.41
512.93

Table 1: This table shows us the time of climbing stairs in each trials. Mass=53.0±0.1kg
The accepted gravitational force in Ankara: 9.78 N
Height of one stair: 16.3±0.1cm = 0.163±0.001m
There was 11*4=44 stairs so ;
The total height of stairs: 7.172 ±0.001m
(I used the uncertanities as the minimum unit of measurement.) trial numberpower (watt)
1294.1±3.3
2268.0±2.8
3300.2±3.4
4277.2±2.9
5288.0±3.2

Table 2: shows us the powers in different trials.
Power (watt)=mass (kg) *gravitational acceleration (m/s2)*height(m)/time (s) So :
Trial 1: P1: (53.0±1kg)*(9.78m/s2)*7.172±0.001m)/12.64±0.01s=294.1±3.3 RESULTS:
Range =maximum value -minimum value
300.2-277.2=23
Uncertanity=range/2
23/2=11.5
Mean=294.1+268.0+300.2+277.2+288.0/5=285.5+15.6
285.5±11.5
Conclusion Evaluation
I found my power 285.5±11.5W . The accepted value of horsepower is 745.7 (http://en.wikipedia.org/wiki/Horsepower) My power is %38.2 of an horse. There were some limitations in the experiment like wearing boots, change in the distance between in two different stairs, performance decrease because of fatigue and it’s the power that in those stairs it can be...