| Basis For Comparison | Wattmeter | Energy Meter |
|---|---|---|
| Definition | It measures the power flows in the circuit | The energy meter measures the energy consume by the electrical load. |
| Unit | Measures power in watt. | Measures energy in joules. |
| Working Principle | Current Carrying conductor place in a magnetic field experiences a torque. | Work on the principle of conversion of electrical energy into mechanical work. |
| Construction | Fixed and moving coil, Control system, damping system, Scale & pointer. | Driving system, moving system, braking system and counting mechanism are the four main parts of the energy meter. |
| Applications | It is used for measuring power in an electrical circuit and for determining the power rating of the appliances. | It is used for measuring electrical energy in homes and industries. |