Five bulbs are connected in a series circuit. If the third bulb in the middle blows out,what happens?

What are the units of resistance?

You are given a resistance wire of length $50 \,cm$ and a battery of negligible resistance. In which of the following cases is the largest amount of heat generated?

How can we measure the potential difference across the ends of a conductor?

From the listed electrical devices,which releases heat energy that is not appreciated?

$(a)$ State the commercial unit of electric energy and find its relation with its $SI$ unit.
$(b)$ The current through a resistor is made three times its initial value. Calculate how it will affect the heat produced in the resistor.
$(c)$ Find the increase in the amount of heat generated in a conductor if another conductor of double resistance is connected in the circuit,keeping all other factors unchanged.