Instantaneous emf is generally expressed as:

$\overline{){\mathbf{\epsilon}}{\mathbf{=}}{{\mathbf{\epsilon}}}_{{\mathbf{0}}}{\mathbf{c}}{\mathbf{o}}{\mathbf{s}}{\mathbf{\omega}}{\mathbf{t}}}$

The angle,

θ = ωt = 2πft = (2π)(60)(60 × 10^{-3}) = 22.62 rad

22.62 rad = (22.62rad)(180°/π rad) = 216°

Draw the phasor for the emf = (170 V) cos ((2π*60 Hz)t) at t = 60 ms. Tail at the origin.

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