Which of the following materials has the highest number of free electrons?

Two electric lamps of $100\, W$ and $25\, W$ respectively are joined in parallel to a supply of $200\, V$. Calculate the total current flowing through the circuit. (in $, A$)

An electric geyser is connected to a $220 \; V$ line and consumes $4.4 \; kWh$ of electrical energy in $1 \; hour$. What is the resistance of the geyser?

In the process of electroplating a chromium coating onto an iron spoon,where should the chromium rod be connected?

When three resistors of $5 \Omega$,$10 \Omega$,and $30 \Omega$ are connected in parallel in a circuit,what will be the equivalent resistance?

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.