In a Voltaic cell,what is the positive electrode (cathode) made of?

Why are alloys commonly used in electrical heating devices?

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.

$A$ wire of resistance $10 \, \Omega$ is bent in the form of a closed circle. What is the effective resistance between the two points at the ends of any diameter of this circle?

How does the resistivity of alloys compare with those of pure metals from which they may have been formed?

What is meant by an electric circuit? Draw a circuit diagram to show an electric circuit comprising a battery of two cells,a resistor,an ammeter,and a plug key when the circuit is closed.