关于电流的大小，下列说法中正确的是（ ）
A．电流通过导体的时间越长，电流就越大
B．通过导体横截面的电量越多，电流就越大
C．在一定时间内通过某一横截面的电量越多，电流就越大
D．电流的大小与通电时间及通过导体横截面的电量均无关系
A、电流的大小等于1s内通过导体横截面的电荷量；与通电时间大小无关；故A错误；
B、电流的大小等于1s内通过导体横截面的电荷量；电流大小即与电荷量有关，又与时间有关；故B错误；
C、根据电流定义式I=
．在一定时间内通过某一横截面的电量越多，电流就越大；故C正确；Q t
D、根据电流定义式I=
．电流大小即与电荷量有关，又与时间有关；故D错误；Q t
故选C．
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