What is the frequency of direct current?

The instantaneous current from an a.c. source is i=0.5 sin 314 t. what is the frequency of the current?

What is the direction of induced current when main current in an inductive circuit is switched on.

Define electric current. What is its S.I. unit? Is it a scalar or a vector quantity? What is the direction of electric current?

What is the direction of induced current when main current in an inductive circuit is switched off.

The electron current in the direction from B to A is decreasing. What is the direction of induced current in the metallic loop kept above the wire as shown in the figure.

What is the difference between direct current and alternating current? How many times does AC used in India change direction in one second?

Fill in the blanks The frequency of alternating current in India is _________.

A series circuit with L = 0.12H, C = 0.48 mF and R = 25 ohm, is connected to a 220V variable frequency power supply. At what frequency is the circuit current maximum ?