Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Current Electricity
The r.m.s. potential difference between the red live wire and black neutral wire in Indian domestic electric supply is
1
160 V
2
220 V
3
300 V
4
More than one of the above
5
None of the above