Explain solar energy and discuss at least two ways it has been used.

What is the mathematical definition of Kw?

Q5: Derive the expression for power P = VI in an electrical circuit. Q6: What is the resistance of an electric arc lamp, if the lamp uses 20A20A when connected to a 220 volt? Q7: A 162 resistor is connected to a 48v battery. What is the charge flow through it in one minute? Q8: A wire having an area of cross section = 6mm? and another wire having an area of cross section = 10mm2, have the same length and are made up of the same material. Which wire has more resistance? Q9: In two minutes, 120C of charge flow through a conductor. What is the current flowing through it and the voltage across the terminals if the resistance of the conductor is equal to 22? Q10. 100 cm length of wire that is 1.5mm2 in cross section has a measured resistance of 12. Calculate the resistivity of the used material. Q11. Some homes use solid wire having a cross-sectional area of 4mm2 to provide electrical distribution to outlets and light sockets. Determine the resistance of 24 meters of this solid wire.…

Figure 1 shows a graph of Current (mA) vs Voltage (V) for three different materials namely A, B and C. Based on the graph, answer the following questions: (i) Sketch a graph for Power (W) vs Current (mA) for Material B. On the sketched graph, show the values of power when the values of current are 50 mA and 100 mA. Assume Materials A and C have cylindrical shape with the same length. If cross sectional area of Material A is double as compared to Material C, determine the ratio of resistivity of Material A (ii) to Material C. (iii) Find the equivalent conductance, G, when the three materials are connected in series and also when they are connected in parallel. Give your answer in two decimal points. B 100 80 60 40 20 1 3 4 Voltage (V) Figure 1 Current (mA)