| Analog Wattmeter | Digital Wattmeter |
|---|---|
| Due to moving parts there are losses and friction at bearings. | As there are no moving parts,mechanical losses are reduced. |
| Accuracy is less compared to digital wattmeters. | Accuracy is high as compared to analog wattmeters. |
| Error may take place at the time of reading the scale due to its non-linearity. | Digital display facilitates to read the power in fraction and in correct fashion. |
| It does not required any auxiliary supply. | It required auxiliary d.c. supply work. |
| More reliable as no complications in design and avoidance of electric components. | Reliability is less as compared to analog to work. |
| No effect of supply transients on performance of meter. | Any supply transients may damage the wattmeters. |
| More stable to vibration and temperature variations. | Considerable effect of vibration and temperature on performance of electric components. |