When illuminated the i – v relationship for a photocell is i = ev − 12 A. For v = −2, 2, and 3 V, find the device power and state whether it is absorbing or delivering power.
A new 6-V alkaline lantern battery delivers 237.5 kJ of energy during its lifetime. How long will the battery last in an application that draws 20 mA continuously. Assume that the battery voltage is constant.