https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-radios-and-cellphones-catch-signals-from-air/x4352f0cb3cc997f5:the-electronic-components-inside-every-radio-and-cellphone/e/leading-and-lagging-in-ac-circuits 2026-04-15T00:13:52.314079129Z Leading and lagging in ac circuits Let's solve some problems to better understand the leading and lagging of current and voltage in ac circuits. We will identify which one of the two leads or lags in different kinds of pure loads, inductive, capacitive and resistive, and also gain insight into why that happens. Aakash exercise https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-radios-and-cellphones-catch-signals-from-air/x4352f0cb3cc997f5:the-electronic-components-inside-every-radio-and-cellphone/e/phase-difference-between-voltage-and-current 2026-04-15T00:13:52.314079129Z Phase difference between voltage and current (using trigonometric identities) Let's solve some problems to better understand the phase difference between current and voltage in purely resistive, inductive, or capacitive circuits. Aakash exercise https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-radios-and-cellphones-catch-signals-from-air/x4352f0cb3cc997f5:the-electronic-components-inside-every-radio-and-cellphone/e/leading-and-lagging-in-graphs 2026-04-15T00:13:52.314079129Z Leading and lagging in graphs (qualitative) Let's solve some problems to be able to identify from graphs, the phase relationship between the quantities. We will understand how to relate the graphs with their equations and also how to spot which curve is leading or lagging behind another. Aakash exercise https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-radios-and-cellphones-catch-signals-from-air/x4352f0cb3cc997f5:the-electronic-components-inside-every-radio-and-cellphone/e/relating-curves-of-alternating-functions-with-their-equations 2026-04-15T00:13:52.314079129Z Leading and lagging in graphs (quantitative) Let's solve some problems to better understand how to relate the curves of alternating functions with their equations. How, given curves, we can identify the equations representing them and how, given equations, we can identify the curves. Aakash exercise https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-radios-and-cellphones-catch-signals-from-air/x4352f0cb3cc997f5:the-electronic-components-inside-every-radio-and-cellphone/e/current-and-potential-curves-for-circuit-elements 2026-04-15T00:13:52.314079129Z Current and potential curves for circuit elements Let's solve some problems to graphically understand the phase difference between current and potential for various circuit elements in an ac circuit. Aakash exercise https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-radios-and-cellphones-catch-signals-from-air/x4352f0cb3cc997f5:the-electronic-components-inside-every-radio-and-cellphone/e/effect-of-frequency-on-current 2026-04-15T00:13:52.314079129Z Effect of frequency on current Let's solve some problems to better understand how the frequency variation in a circuit affects the impedance and thus, the current in the circuit.  Aakash exercise https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-radios-and-cellphones-catch-signals-from-air/x4352f0cb3cc997f5:the-electronic-components-inside-every-radio-and-cellphone/e/effect-of-changing-l-c-on-current 2026-04-15T00:13:52.314079129Z Effect of changing L/C on current in purely inductive/capacitive circuits Let's solve some problems where we change the inductance or capacitance of a circuit element and observe its effect on the current in a circuit containing an ac source. We will change the inductance and capacitance in various ways. Aakash exercise