An electric bulb is connected to a $220 \ V$ generator. The current is $0.50 \ A$. What is the power of the bulb?

Electric current flows through three lamps when arranged in $(a)$ a series and $(b)$ a parallel circuit. If the filament of one lamp breaks,explain what happens to the other two lamps in both cases.

Write the $SI$ unit of resistivity.

When two resistors of resistances $R_{1}$ and $R_{2}$ are connected in parallel,the net resistance is $3 \, \Omega$. When connected in series,its value is $16 \, \Omega$. Calculate the values of $R_{1}$ and $R_{2}$.

Which of the following is a semiconductor element?

The following table provides the resistivity of three samples:

Sample	$A$	$B$	$C$
Resistivity	$1.6 \times 10^{-8} \Omega \cdot m$	$5.2 \times 10^{-8} \Omega \cdot m$	$100 \times 10^{-6} \Omega \cdot m$

Which of them is suitable for heating elements of electrical appliances and why?