Nowadays, electric bicycles and electric cars are becoming more and more popular. They all use motors to obtain power. The nameplate of a DC motor is marked with "220V 5.5kW"Now the electric bicycle, electric cars gradually spread, they are used to obtain power motor DC motor. A nameplate marked "220V 5.5kW, resistance motor coil is 0.4 ohms.
Answer: (1) this motor works normally, 1H, consume 5.5kW, h Electric energy;(2) the motor coil produces 9 * 105J of heat;(3) the coil is stuck and can not rotate, and the electric energy can not be converted into mechanical energy. All the energy consumed can be converted into internal energy, so a great deal of heat is produced and the temperature is raised rapidly
(3) the coil is stuck and can not rotate, and the electric energy can not be converted into mechanical energy. All the energy consumed can be converted into internal energy, so a great deal of heat is produced and the temperature is raised rapidly
(1) P= dreamsWTHence the motor power consumption of W=Pt=5.5kW * 1h=5.5kW H?(2) P=UI dreamsThe normal work of the motor current frequency is I=PU=5500W220V=25A,The heat generated by the coil is Q=I2Rt= (25A) 2 * 0.4 * 3600s=9 * 105J.
