Answer: 0.42watts
Step-by-step explanation:
Energy of the battery = 500 J
Time = 1200 seconds
Power of the instrument = ?
Recall that power is the rate of energy expended in doing work. Thus, power is energy expended divided by time taken.
i.e Power = (energy/time)
Power = 500J/1200 seconds
Power = 0.416 watts (Round to the nearest hundredth which is 0.42 watts)
Thus, the power of the instrument is 0.42watts