Class 4 (4th Engineer) MET 📅 Sep 2023

Exam Question

(a) Define Work, Power and Efficiency (6)

(b) A battery is charged with a constant current of 16 amperes for 11 hours after which time it is considered to be fully charged, its voltage per cell being recorded as 2.2V. Find its ampere hour efficiency if it is (10)

(i) Discharged at a rate of 16 amperes for 10 hours, and

(ii) 28 amperes for 4 hours.

In either case discharge was discontinued when the voltage per cell fell to 1.8 V.

Reference Answer

**(a) Define Work, Power and Efficiency (6 marks)**
* **Work (W)**:
* **Definition**: In physics, work is the energy transferred to or from an object via the application of a force along a displacement. It quantifies the amount of energy change in a system due to a force acting over a distance.
* **Formula**: Work ($$W$$) is calculated as the product of the force ($$F$$) applied and the displacement ($$d$$$) of the object in the direction of the force.

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