Battery life is very important for convenience. The electricity bill is sometimes the biggest cost in a data centre [citation needed!]. Saving energy in computing is always a good idea. In this section we will examine energy and performance and energy saving techniques.
Energy in an electronic device gets used in several different ways: for a Mobile Phone we might see the following budget:
A mobile phone might have a 10 Wh capacity (36 kilo Joules).
| 1: (C) 2008-18, DJ Greaves, University of Cambridge, Computer Laboratory. |