Name the device$/$instrument used to measure potential difference. How is it connected in an electric circuit ?
An electric heater rated $600\, W$ operates $6$ hours per day. Find the cost to operate it for $30$ days at ₹ $3.00$ per unit.
An electric bulb is connected to a $220\, V$ generator. The current is $0.50 A$. What is the power of the bulb ?
A potential difference $V$ is applied across a conductor of length $L$ and diameter $D .$ How is the resistance $R$ of the conductor affected, when in turn $(i)$ $V$ is halved $(ii)$ $L$ is halved and $(iii)$ $D$ is doubled ? Justify your answer in each case.
Three incandescent bulbs of $100\, W$ each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source. Will the bulb in the two circuits glow with the same brightness? Justify your answer.