Out of the following bulbs rated $40\, W , 220\, V$ $60\, W , 220 \,V$ and $100\, W , 220\, V$ which one will glow the brightest when connected in series to a supply of $220\, V$ $?$
State $Ohm's$ law. Write the mathematical representation of $Ohm's$ law. Use this relationship to define $1\, ohm.$ List two disadvantages of connecting different electrical appliances in series.
A metal has a very large number of free electrons and a non$-$metal very less number of free electrons.
What is potential difference ? Is it a scalar quantity or a vector quantity ? Give its $SI$ units.
In a household, $5$ tube lights of $40\, W$ each are used for $5$ hours and an electric press of $500 \,W$ for $4$ hour everyday. Calculate the total energy consumed by the tube lights and press in a month of $30$ days.