Give two practical applications of the heating effect of current.

Name and define the $SI$ unit of current. Calculate the number of electrons that flow through a conductor in $1$ second to constitute a current of $1$ ampere. (Charge on an electron $= 1.6 \times 10^{-19} \text{ C}$)

$(a)$ $(i)$ What is meant by saying that the potential difference between two points is $1 \, V$? $(ii)$ How much energy is given to $5 \, C$ of charge passing through a $12 \, V$ battery? $(b)$ Describe an activity with a necessary electric circuit to study the factors on which the resistance of a conducting wire depends.

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

If three bulbs of $100 \; W$, $60 \; W$, and $40 \; W$ are used for $2 \; \text{hours}$ daily in a house, how many units of electrical energy are consumed in $30 \; \text{days}$?

What type of electric charge does an electron possess?