For the following AC voltage and current expressions: 1. (10pt) Draw phasor diagram 2. (10pt) Find phase difference between voltage and current 3. (15pt) Determine which phasor leads, voltage or current. \text { a) } I=10 \angle 60^{\circ} \mathrm{A} \underline{V}=-5 \angle-45^{\circ} \mathrm{V} \text { b) } v(t)=15 \cos \left(10 t+120^{\circ}\right)-5 \cos \left(10 t-60^{\circ}\right) i(t)=10 \sin \left(10 t+30^{\circ}\right)+4 \sin \left(10 t-150^{\circ}\right)

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