Class 4 (4th Engineer) MET 📅 Feb 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 (1) discharged at a rate of 16 amperes for 10 hours, and (2) 28 amperes for 4 hours. In either case discharge was discontinued when the voltage per cell fell to 1.8V (10)

Reference Answer

### Part (a): Definitions
#### 1. Work (W)
* **Definition**: Work is done when a force acting on a body causes a displacement of that body in the direction of the force. It represents the transfer of energy from one system to another.
* **Formula**: The work done is calculated as the product of the magnitude of the force (F) and the distance (d) moved in the direction of the force.

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