A rechargeable battery pack used in a camping lantern is capable of delivering a…
PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy
Problem
A rechargeable battery pack used in a camping lantern is capable of delivering a total of 9.0×104J of energy before it must be recharged. When the lantern is switched on, it draws a steady power of 5.0W. Assume the power draw remains constant until the battery is fully discharged.
(a) Calculate the maximum length of time, in hours, that the lantern can operate continuously before the battery is completely depleted.
(b) The campers decide to use the lantern only during the evening for 4.0h each night. Determine the number of full evenings the lantern can be used before recharging is required.