ࡱ>  "bjbjpMpM .*'o_'o_' nn8$#(??UUU$oEUU4K%&%&%&UU%&%&%&z&p%#j̰a0| %&$%&%n y:'Investigation of DC circuits with series connected resistors. Investigation of DC circuits with parallel resistors. 1 Laboratory work What isconsidered to beseriesconnected circuit? FormulateOhm's lawandthe secondKirchhof law. How torelatethe voltageadded to theseries-mountedreceivers, withavoltage ofthe each receiver? How will change the voltage in the resistor R2 if we change resistance of the resitor VR1? Parallel cirquit. Draw, explain how we can calculate various parameters. FormulateOhm's lawand the firstKirchhofs law. How will changecurrentI4,ifwe increase resistance ofresistorR5 two times? Calculate thecurrentI,whereU= 10V, R4= 30, R5= 100, R6= 200.(parallel mounted). What is thepowerdrawn fromthe powersource,if thefourreceivers are connected in parallel,andtheirresistance,respectivelyequal to: R1= 50, R2= 100, R3= 200, R4= 50?Receiversconnected to a12V powersource. Investigation of series circuit AC Circuit. 2 Laboratory work Explain in which cirquit and inwhat conditions we can see phenomena of voltage resonance? How we can determine ,from the readings of multimeters, that the cirquit is set to voltageresonance? How we can determine ,from the readings of multimeters, when > 0and when<0? Draw thecircuitdiagramof vectors,where R`"0,andXL>XC. Draw thecircuitdiagramof vectors,where R`"0,andXL<XC. Explane the change of coschangingcapacitance. Investigation of single-phase transformer. 3 Laboratory work Explain thestructure of the transformer, operation principleandpurpose. Whatwe callthe transformationandefficiency coefficient? Whythe transformationcoefficientis calculatedin the idle work mode? How we determineenergy losses inthe transformer? tQ R N P x z | pz| v¶똍…zzzzhRhbCJaJhbCJaJhbhbCJaJh6"CJaJh2"}5CJaJh2"}hR5 h2"}5h2"}CJaJnH tH h7cCJaJhRCJaJhRhRCJaJh6"hR5>*CJaJhh2"}5CJaJh]h2"}50tR P z | |z| ^gd2"} & F2gdo & FgdR`gd.%`gd2"} gd2"}vz|2jv"$&HǼ~sh]hUh2"}hg5h2"}5>*CJaJhg5>*CJaJh4s5>*CJaJh h4sCJaJh CJaJUh hdCJaJhdCJaJh h CJaJh h(WCJaJh 5>*CJaJhh2"}5CJaJh2"}5CJaJh2"}h2"}5h]h2"}5h2"}CJaJnH tH hbCJaJ!|$HJ,  & F0gd2"} gdD $ & F/a$gd2"} & F/gd2"}`gd4s`gd2"} gd2"}Explain how theefficiencydependson the currentstrength ofthe secondary winding. Investigation of a three-phase, Y-connected circuit. 4 Laboratory work Explain the connection of Y circuit in the three-phase network. What kind of receiver is considered symmetrical? What kind of receiver is considered asymmetric? Can a three-phase network receiver work without a neutral wire? What happens if we cut neutral wire in three-phase network symmetrical receiver. Investigation of a three-phase asynchronous motor and frequency converter. 5 Laboratory work How we can controllasynchronous motorsrpm? How isthe enginepoweris takenfrom the network? Explainhow you canchange therotation direction of the motor. Explainhow to make thethree-phase asynchronous motor work one- phase network.      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