问题
选择题
Everyone can receive education.That is to say,education is taken as a right rather than a(n)_________.[ ]
A.privilege
B.encouragement
C.assistance
D.dignity
答案
答案:A
Everyone can receive education.That is to say,education is taken as a right rather than a(n)_________.[ ]
A.privilege
B.encouragement
C.assistance
D.dignity
答案:A
影响物质材料电阻的因数很多,一般金属材料的电阻随温度的升高而增大,半导体材料的电阻随温度的升高而减少.课题组在研究某种导电材料的用电器件Z的导电规律时,利用图(1)分压电路测得其电压与电流的关系如表所示:
U(V) | 0.40 | 0.60 | 0.80 | 1.00 | 1.20 | 1.50 | 1.60 |
I(A) | 0.20 | 0.45 | 0.80 | 1.25 | 1.80 | 2.81 | 3.20 |
(2)把用电器件Z接入图(2)电路中,电流表的示数为1.8A,电池的电动势为3V,内阻不计,则电阻R的电功率为______W;
(3)根据表中的数据找出该用电器Z的电流随电压变化的规律是:I=kUn,则k的数值为______.