stealthelectric
New Member
Hi:
If asked to find the power factor - I know the formula to use is cosθ - but sometimes the answer is requires a minus sign in the cos - like cos-θ.
Is this to do with the direction of the sinusoids and/or whether one leads or lags the other. How do I know when to use the minus sign and when not to?
many thanks
If asked to find the power factor - I know the formula to use is cosθ - but sometimes the answer is requires a minus sign in the cos - like cos-θ.
Is this to do with the direction of the sinusoids and/or whether one leads or lags the other. How do I know when to use the minus sign and when not to?
many thanks