(d)解:KV:-30+5×10+V+60 0∴Vr。=-80(7) 5A6i1,PHy去308×5 60V10 三=46≤产生 O30V 23>0吸60V 5A + _ + + _ _ 30V 10 V I s (d) 0 80( ) :KVL : 30 5 10 60 V V V Is Is = = − 解 − + + + 吸 收 产 生 250 0 5 10 400 0 80 5 2 2 = = = = − = = − W P I R W P V I R I s Is s 吸 收 产 生 300 0 60 5 150 0 30 5 6 0 3 0 = = = = − = − = − W P V I W P V I V V