Question

A pair of alkaline D batteries can provide about 98000 J of electric energy at 3.0 V. If a current of 2 A flows through two D batteries while they’re in the circuit of a flashlight, how long will the batteries be able to provide power to the flashlight?

Answer 1

Answer:

4.53 hours

Explanation:

Energy, E = 98000 J

Voltage, V = 3 V

Current, i = 2 A

Let t be the time for which the batteries give the power.

Energy = V x i x t

98000 = 3 x 2 x t

t = 16333.33 seconds

t = 4.53 hours