Derive the relation $R=R_{1}+R_{2}+R_{3}$ when three resistors $R_{1}, R_{2}$ and $R_{3}$ are connected in series in an electric circuit.
Electric power is also called $BOTU.$
A nichrome wire has a resistance of $10\, \Omega$. Find the resistance of another nichrome wire, whose length is three times and area of cross-section four times the first wire.
Electrical resistivity of a given metallic wire depends upon
Given below is a circuit showing current flowing in it. Identify each component $A, B, C, D$ of this circuit.