一个5W的节能灯泡，开一年需支付多少电费？ 5W的电灯24小时亮着，一个月需多少度电
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\u2462W=U\u00d7Q\u3002
5W × 24 小时 ×365天 ÷1000 W/小时 =43.8 度电
43.8 × 0.55 元/度 （普通电价） = 24.09 元
5*24*366=43.92度
43.6度电，不过电费单价多少俺不知道。
绛旓細鍙紑200涓皬鏃躲傛牴鎹鎰忥紝led鐏殑鐢靛姛鐜囦负5鐡︼紝鍗0.005KW锛岀敤鐢甸噺涓1搴︾數锛屾牴鎹叕寮忥細鐢ㄧ數閲=鐢ㄧ數鍔熺巼*鐢ㄧ數鏃堕暱锛岄偅涔堢敤鐢垫椂闀=鐢ㄧ數閲/鐢ㄧ數鍔熺巼锛屽嵆鐢ㄧ數鏃堕暱=1/0.005=200锛屾墍浠ed鐏5w鐨勮妭鑳鐨勪竴搴︾數鍙紑200涓皬鏃躲
绛旓細宸茬煡鏄5w,鍙涔樹互1灏忔椂灏辨槸鑰楃數閲 5*1=5(wh)=0.005搴 涔熷氨鏄锛岃1000灏忔椂鎵嶈楃數5搴︺
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