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