Define for polyphase circuit (i) Balanced load (ii) Unbalanced load. Draw one example circuit for each type of load.
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i) Balanced Load: Balanced three phase load is defined as star or delta connection of three equal impedances having equal real parts and equal imaginary parts. 

Example circuit: 

image


ii) Unbalanced Load: When the magnitudes and phase angles of three impedances are differ from each other, then it is called as unbalanced load. OR If a load does not satisfy the condition of balance, then it is called as unbalanced load. 

Example circuit:

image

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