Ten questions. The result tells you which lessons you may skip.
A steady current of \(0.5\,\text{A}\) flows through a lamp for \(2\) minutes. The charge through the lamp is
The current in a wire changes with time. The charge that passes between two instants is
A current of \(2\,\text{A}\) is spread evenly over a section of \(4\,\text{mm}^2\). The current density is
In a wire carrying a current, the free electrons drift
The same current flows through a wire of half the diameter. The drift speed becomes
A wire of resistance \(R\) is stretched to twice its length. Its new resistance is
The resistance of a copper wire rises when it is heated because
A lamp's I-V graph bends. At \(1\,\text{A}\) the voltage is \(2\,\text{V}\) and at \(2\,\text{A}\) it is \(6\,\text{V}\). The resistance
A \(2\,\text{kW}\) heater runs for \(5\) hours. The energy used, in units on the bill, is
A \(40\,\text{W}\) and a \(100\,\text{W}\) bulb, both rated for \(220\,\text{V}\), are joined in series across \(220\,\text{V}\). Which glows brighter?