The graph above shows the way a desktop personal computer and 15″ CRT screen uses electricity. The computer tested was a rather old ordinary desktop computer. The test consisted simply of switching it on and then playing a child’s computer game for an hour and then switching it off again.
The PC proved to be a resistive load (Watts and VA measured were almost exactly the same).
The summary figures for the test are:
| Max. Power drawn | 160W |
| Engery consumed per hour of normal use | 0.14kWh |
