Unit of electric power may also be expressed as

When a high resistance voltmeter is connected directly across an electric bulb, its reading is $2\, V$ An electric cell is sending the current of $0.4$ ampere (measured by. an ammeter) in the electric circuit.

$(a)$ Draw the circuit.

$(b)$ Find the resistance of the electric bulb.

$(c)$ State the law that is applied for making these calculation. If a graph is plotted between $V$ and $I,$ show the nature of the graph obtained.

The applied potential difference across a given resistor is altered so that the heat produced per second increases by a factor of $16.$ By what factor the applied potential difference changes.

$Ohm's$ law is a relation between the power used in a circuit to the current and the potential difference.

What is the direction of conventional current?

In the figure given below, $A, B$. and $C$ are three ammeters. The ammeter $B$ reads $0.5\, A .$ (All the ammeters have negligible resistance.) Calculate
$(i)$ the readings in the ammeters $A$ and $C$. $(ii)$ the total resistance of the circuit.