如图所示的电路中，电源电压恒为18V，电阻R1的阻值为10Ω，电流表A的0～3A量程损坏.闭合开关S，电压表示数为13伏，两电表的表盘如图所示.求：

题干

如图所示的电路中，电源电压恒为18V，电阻R₁的阻值为10Ω，电流表A的0～3A量程损坏.闭合开关S，电压表示数为13伏，两电表的表盘如图所示.求：

上一题下一题 0.0难度选择题更新时间:2018-07-25 11:03:50

If you spend more than 100 yuan, you can get a pair of tennis rackets. Hurry up and have a look!

Jeans Brand (牌子): Robin Hood Color: black, blue, white Price: Only ￥45	Brand: Li Ning Color: black, pink, yellow Material: wool Price: ￥48 after 50% off
Sports shoes Brand: Nike Color: white, red, blue Price: ￥166	Sports socks Brand: Langsha Color: white, black, blue Material: cotton Price: ￥9 for each
Backpack (背包) Brand: Kids Color: black, blue, brown Price: ￥25 and get a sports cap for free.	Shorts Brand: Adidas Color: yellow, black, red Price: ￥30 for each, but ￥55 for two
T- shirt