List of top Electrical Circuits Questions on Ideal voltage and current sources

The linear temperature coefficient of the material of a wire is \(x \times 10^{-4} \, \text{°C}^{-1}\). The resistance of this wire increased from 50 \(\Omega\) at 25 °C to 60 \(\Omega\) at 75 °C. The value of \(x\) is ________ (rounded off to two decimal places).
Power consumed by the \(3\,\Omega\) resistor is \(12\ \text{W}\) in the given circuit. The value of the resistor \(R\) in the circuit is _______ \(\Omega\).

Three resistive loads are connected to ideal voltage and current sources as shown in the circuit below. The voltage $V_{AB}$ across the terminals A and B is equal to \(\underline{\hspace{1cm}}\) V.