(1)∵U=32V,I=0.8A,
∴P=UI=32V×0.8A=25.6W.
答:正常行驶时电动机的功率为25.6W.
(2)∵I=0.8A,R=3Ω,t=20min=1200s,
∴Q=I2Rt=(0.8A)2×3Ω×1200s=2304J.
答:电动机发出的热量是2304J.
(1)∵U=32V,I=0.8A,
∴P=UI=32V×0.8A=25.6W.
答:正常行驶时电动机的功率为25.6W.
(2)∵I=0.8A,R=3Ω,t=20min=1200s,
∴Q=I2Rt=(0.8A)2×3Ω×1200s=2304J.
答:电动机发出的热量是2304J.