The electric current that always flows in the same direction is called alternating current.

$1\, \mu A = \dots \dots \dots \,mA$

Which device uses direct current $(DC)$?

Which of the following substances does not contain free electrons?

An electric bulb draws a current of $0.2 A$ when the voltage is $220 V$. Calculate the amount of charge flowing through it in one hour.

$(a)$ What are the values of $mA$ and $\mu A$ in terms of Ampere $(A)$?
$(b)$ Draw the symbols of a battery and a rheostat.