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 andthe 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 theresistivity of the used material.Q11. Some homes use solid wire having a cross-sectional area of 4mm2 to provide electrical distribution tooutlets and light sockets. Determine the resistance of 24 meters of this solid wire. (resistivity of the usedwire = 2x10-8 Q.m).Q12. What is the power and the current flowing through a 250v light bulb each second if the electric chargequantity is 0.3C?Q13. How many coulombs of charge flow through a circuit carrying a current of 2A in two minutes?Q14. The current in a certain conductor is 40mA. What is the total charge in coulombs that passes through aconductor in 1.5 second?Q15. How much time is required for 100 coulombs of charge to flow past a point if the rate of flow is 2A?Q16. Calculate the resistance of a piece of aluminum that is 10cm long and has a cross-sectional area of 104m?. What is the resistance of a piece of glass with the same dimensions? PAI=2.82x10$2.m, pglass=10102.m.Q17. 0.90V potential difference is maintained across a 1.5m length of tungsten wire that has a cross-sectional area of 0.60mm2. What is the current in the wire? pungsten=5.6x10*2.mQ18. A 2.4m length of wire that is 0.031cm? in cross section has a measured resistance of 0.24Q. Calculatethe resistivity of the used material.Q19. The external diameter of a 5m long hollow tube is 10cm and the thickness of its wall is 5mm. If thespecific resistance of used material is 1.7 x 105 Q.m, then determine its resistance.Q20. If a current of 0.75A, when a battery of 1.5V is connected to the wire of 5m having cross sectional area2.5x10 m2, then determine the resistivity.Q21. What is the ratio of the resistivity of 2 wires having the same length and same resistance with area ofcross section 2m? and 5m2 respectively.Q22. The filament of a 100W, 120V light bulb is a tungsten wire 0.035 mm in diameter and 27.7 cm in long.a. What is the light bulb's operating resistance?b. Determine the cross sectional area of the filament.c. Calculate the resistivity of the tungsten at the filament's operating temperature.d. What is the total charge in coulombs that passes through a filament's in two minutes?Q23. A constant current source supplies a current of 300 mA to a load of 1K. When the load is changed to1002, find the load current.Q24. A piece of silver wire has a resistance of 1 Q. What will be the resistance of another conductor wireof one-third the length and one-third the diameter, if the specific resistance of the used wire is 30 times that ofsilver.Q25. How long can a 1.5 V flashlight battery provide a current of 250 mA to light the bulb if the ampere-hour rating is 16 Ah?Q26. How much energy in kilowatt-hours is required to light a 60W bulb continuously for one year?

Question

Accepted Answer

5)
From Ohm’s law, we know that ⇒I=VRPower in a circuit is the amount of work done by the circuit in…

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?