题目

From a plane we can see the fields, cities, mountains or seas below. If we go into space, we see more and more of the earth. The sea looks very beautiful when the sun is shining on it. But it can be very terrible when there is a strong wind. The sea is very big. It nearly covers three quarters of the earth. The sea is also very deep in some places. There is one place and at that place the sea is about 11 kilometres deep. The highest mountain in the world is about 9 kilometres high. If we put that mountain into the sea at that place, there will be still 2 kilometres of water above it! 如图所示，直流电动机上的电源电压U＝3V且保持不变，电动机线圈电阻R＝0.5Ω，不计各处摩擦，电动机正常运转时电路上的电流I＝1A。电源的电功率是______W，通电1min电动机产生的热量是______ J。