Mean value of alternating current.
Answer:- Mean value of a.c. is that value of steady current which sends the same amount of charge, through a circuit, in same time as is done by a.c. in half its cycle.
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Impedance.
Answer:- Total effective opposition offered, by all the circuit elements in an a.c circuit is called impedance and is denoted by Z.
What is quality factor ?
Answer:- Quality factor or Q-factor measured the performance or sharpness of a L-R-C circuit.High the value of quality factor high is the performance of L-R-C circuit. ★ It is a dimensionless quantity. Mathematically, Q=w0/(w2-w1) Where, w2-w1 = bandwidth =R/L
What is Hysteresis loss in transfermer ?
Answer:- The soft iron core in transfermer undergoes a complete cycle of magnetisation(that means magnetisation, demagnetization, remagnetisation) due to Alternating current (because it continuously change its direction).That magnetisation cycle results in some energy loss in form of heat called Hysteresis loss.
what is wattless current ?
Answer:- The current in an AC circuit is said to be wattless current when the average power consumed in such circuit is zero. e.g P(average)=0 means the vertical component is zero so the vertical component of current is called wattless current.
Difference between AC & DC
Answer :- Direct current Alternating current • current flow only • current changes its One direction direction periodicly • It cannot transfer • It can travel at long at long distance distance • Frequency is zero • Frequency is 50hz in DC. 60hz in AC • source is battery • source is generator • DC circuit have • AC circuit have resi only resistor tor capacitor and inductor • power factor is. ...