exp%2016 wk3

# exp%2016 wk3 - Experiment 1 6 phase Angle, Active, and...

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Experiment 1 6 phase Angle, Active, and Apparent Power OBJECllVE To study the meaning of angle. To study the relationship between active and apparent power. ____--------- In DCFmIt,-taT~tanw ioad, as voltage across the resistor increases, current through the resistor increases. This is ako true in an AC circuii with a resistance load. If a sinusaidal voltage e is applied across a reststor R, instantaneous variations of I through R follow exactly the mstantaneoLls changes h voltage e. Thus, at the instant e is going through xero, i is going through zero. When e maximum, i is at maximum. When voltage and cunent are Tn step" witf-~ each other, they are said to be in phase. This relat'ihip is shown graphically in Flaure 16-1. However, it only occurs when the circuit load is a pure resIstm.

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Phase Angle, Active, and Apparent Power fhem are conditim under which the wmnt Is Rot "m phaseu with tfievdtage. Such a condition is shawn in Figure 16-2 (a) where the current attains its maximum value some 30 rdedricat degrees after the vdtage. The is said to "lag" behind tfm voltage by30". On the other hand, the current waveh shown in Fwm 16-2 @) Utns its maximum value 30" ahead of voltage. The current b 'feacf the dage by 30".
P&& Angle, Active, and Apparent Power To complete the pichtre, the current in Figure 183 (a) lags behind the voltage by 90". (we would also be correct in stating that the voltage leads the current by 90"). in Figure 16-3 (b), the current leads the voltage by 90". (We could also say that voltage "fags" the current by 90"). Here we find the interesting condition where the current is zero at the instant when the vokge is maximum and vice-versa.

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Phase Angle, Active, and Apparent Power Ahhwgh this would appear qub improbable because we have been told up until ~s~ntthatthevattageca~888thecunent.Hcrwthencanwehavemaximum current when the voltage is zero? It occurs when a bad (smh as on containing an indudororcapaoltor)#rhlchbsI.nnnMeBfst~~netsyisconnecQedtoanAC source.TheWabsorbsenergyduringpattofthec)rdeend,dependinguponhow
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## This note was uploaded on 02/22/2010 for the course EEE 360 taught by Professor Gorur during the Spring '08 term at Arizona.

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exp%2016 wk3 - Experiment 1 6 phase Angle, Active, and...

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