First slide

Alternating Current and voltage

Question

The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit is as shown in fig. Which of the following statements is correct

Moderate

A

The voltage lags behind the current by $π$ / 2
B

The voltage leads the current by $π$ / 2
C

The voltage and the current are in phase
D

The voltage leads the current by $π$

Solution

At t = 0, phase of the voltage is zero, while phase of the current is $- \frac{π}{2}$ i.e., voltage leads by $\frac{π}{2}$

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