What is Electric Power?Definition,Unit,Types,Formula,Solved Problems

power in dc circuit

Electrical Power Definition The rate at which work is done is called electrical power. An electrical source has  electrical charges stored in it. Therefore, the rate of transfer of electrical charges is electrical power. Thus, the more the transfer rate of the charges, the more the power of the source. In other words, the rate … Read more

What is Power? Definition,Unit,Formula,Solved Examples

power formula

A person A can dig 2 feet soil in one hour. An another person B can dig 2 feet soil in two hours. Who has more power? Definitely a person A has more power than person B, because person A is doing the same work in half of the time. Thus, we can define power … Read more

What is a Phase Sequence & Its Significance

positive phase sequence RYB,YBR,BRY

In three phase power system,the order  in which each phase voltages attain positive peak value is called phase sequence. The phase sequence is also known as phase rotation.  if the order of  phase sequence in 3 phase system denoted as RYB, then R phase attains its positive peak value first, after 120 degrees the Y … Read more

Why do 3 phase induction motors not need a neutral?

RYB phase sequence

3 Phase induction motor is a balanced three phase load. Therefore, the induction motor draws a balance current if the supply voltage and the impedance of the motor are balance. The balance current in all three phases of the motor  leads  no current in the neutral. Therefore, there is no need of neutral in the … Read more

Induction Motor Interview Questions and Answers-Q 51-60

  Q.51 What is the major disadvantage of star delta starting of induction motor? In star delta starter, the  stator first get connected in the star. In star, the voltage per phase is VL/√3. Where VL is the line voltage.  The torque produced by motor depends on the voltage  & it is square of the … Read more