(a) An electric heater rated $1100\text{ W}$ operates at $220\text{ V}$. Calculate (i) its resistance, and (ii) the current drawn by it.

The equivalent resistance of the circuit can be calculated using Kirchhoff's laws. First, we need to identify the resistors in the circuit and their values. The resistors are labeled as R1, R2, R3, and R4. The values of the resistors are not provided in the question, so we will assume that they are given in the circuit diagram. Once we have identified the resistors and their values, we can use Kirchhoff's laws to calculate the equivalent resistance of the circuit. Kirchhoff's first law states that the sum of the currents entering a node is equal to the sum of the currents leaving the node. Kirchhoff's second law states that the sum of the voltage changes around a closed loop is equal to zero. By applying these laws to the circuit, we can calculate the equivalent resistance of the circuit. However, without the specific values of the resistors, we cannot provide a numerical answer. Therefore, the final answer is: The equivalent resistance of the circuit can be calculated using Kirchhoff's laws, but the specific values of the resistors are required to provide a numerical answer.