An electric kettle consumes $1 \mathrm{kW}$ of electric power when operated at $220 \mathrm{V}$. A fuse wire of what rating must be used for it?

A child has drawn the electric circuit to study Ohm’s law as shown in figure. His teacher told that the circuit diagram needs correction. Study the circuit diagram and redraw it after making all corrections.

Three $2 \mathrm{\Omega }$ resistors, $A$, $B$ and $C$ are connected as shown in figure. Each of them dissipates energy and can withstand a maximum power of $18 \mathrm{W}$ without melting. Find the maximum current can flow through the three resistors?

Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of $2 \mathrm{\Omega }$ in series with a combination of two resistors ($4 \mathrm{\Omega }$ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the $2 \mathrm{\Omega }$ resistor be the same as that across the parallel combination of $4 \mathrm{\Omega }$ resistors? Give reason.

What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads $5 \mathrm{A}$. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?