In Volta's cell, what is the direction of the flow of electrons?
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.
What do you mean by heating effect of electric current ? Explain the production of heat in a resistor by flow of electric current through it. Name two devices based on heating effect of current.
Two lamps, one is rated $100\, W$ at $220\, V$, and the other $60 \,W$ at $220\, V ,$ are connected in parallel to a $220\, V$ supply. Find the current drawn from the supply line.
A large number of free electrons are present in metals yet no current flows in the absence of electric potential across it. Explain the statement with reason.