Question

One AA battery in a flashlight stores 9400 J. The three LED flashlight bulbs consume 0.5 W. How many hours will the flashlight last?

Answer 1

time = 5.22 hr

Step-by-step explanation:

Given data:

Energy of battery = 9400 J

Power consumed by three led bulb is 0.5 watt

we know Power is give as

`Power = ( energy)/(time)`

plugging all value and solve for time

`time = (energy)/(power)`

`time = (9400)/(0.5)`

time = 18,800 sec

in hour

1 hour = 3600 sec

therefore in 18,800 sec

`time = (18800)/(3600) = 5.22 hr`