# How to calculate time interval between current and voltage waveforms

Is it basically, phase angle / angular frequency?

Also for a ac circuit with a single inductor is the phase angle going to be always 90degres, likewise with a circuit with a single capacitor?

• Yes, where phase angle is in radians; and yes, 90 deg for C and for L. – Chu Nov 1 '19 at 13:28
• Thanks, so (pie /2)/ angular frequency? – Nexus6 Nov 1 '19 at 13:30
• yes............ – Chu Nov 1 '19 at 14:22

For sinusoidal AC circuit, a useful term to remember is: -

C I V I L

• For a (C)apacitor I leads V.
• V leads I for an inductor (L)

In both cases, the leading/lagging is 90 degrees.

If the inductor or capacitor has resistive losses then the phase angle magnitude will be less than 90 degrees.

• What about an ac circuit with a single resistor? Is the phase angle 0 in that case? – Nexus6 Nov 1 '19 at 13:32
• Yes it is @Nexus6 – Andy aka Nov 1 '19 at 13:36
• Thank you @Andy aka's – Nexus6 Nov 1 '19 at 13:37
• I am getting a complex infinity error when I enter into calculator, (pie/0)/150pie – Nexus6 Nov 1 '19 at 13:56
• "pie/0" = infinity – Andy aka Nov 1 '19 at 14:12