∑I=0 and ∑IR=0\sum _{ }^{ }\mathrm{I}=0\text{ and }\sum _{ }^{ }\mathrm{IR}=0∑I=0 and ∑IR=0
∑IR=0 and ∑R=∑E\sum _{ }^{ }IR=0\text{ and }\sum _{ }^{ }R=\sum _{ }^{ }E∑IR=0 and ∑R=∑E
∑I=0 and ∑IR=∑E\sum _{ }^{ }\mathrm{I}=0\text{ and }\sum _{ }^{ }\mathrm{IR}=\sum _{ }^{ }\mathrm{E}∑I=0 and ∑IR=∑E
∑R=0 and ∑I=\sum _{ }^{ }\mathrm{R}=0\text{ and }\sum _{ }^{ }\mathrm{I}=∑R=0 and ∑I=
