Give two practical applications of the heating effect of current.

Three incandescent bulbs of $100\, W$ each are connected in series in an electric circuit. In another circuit,another set of three bulbs of the same wattage are connected in parallel to the same source. Now,if one bulb in both the circuits gets fused,will the rest of the bulbs continue to glow in each circuit? Give reasons.

How will you conclude that the same potential difference (voltage) exists across three resistors connected in a parallel arrangement to a battery?

The quantity of charge flowing past a point multiplied by time is current.

$(a)$ How is the direction of electric current related to the direction of flow of electrons in a wire?
$(b)$ Calculate the current in a circuit,if $500 \, C$ of charge passes through it in $10$ minutes.

The unit $Volt \times Ampere$ represents which physical quantity?