The setup in the figure is used to measure resistance R. The ammeter and voltmeter resistance are
0.01Ω and
2000Ω respectively. Their readings are 2 A and 180 V respectively, giving a measured resistance of
90Ω. The percentage error in the measurement is _______.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1356194/original_28.png)
- -4.5