Question

Efficiency of electrons causes negative charge .give reason.
those who give correct ans I will mark them as brainliest and start to follow.plz its urgent.​

Answer 1

Efficiency of electrons causes negative charge because
1.electrons are mobile(can move freely)
2.so if they gain electrons they cause negative charge

hope helps you

Answer 2

efficiency is the useful work perform in electron the work always perform - ve because the direction(moving) of charge is always opposite to direction of current so the -ve sign is given on electron as his work perform is in - ve direction