Q. Which among the following is an expression for energy?

View solution

Q. A battery converts___________

View solution

Q. A current of 2A flows in a wire offering a resistance of 10ohm. Calculate the energy dissipated by the wire in 0.5 hours.

View solution

Q. Practically, if 10kJ of energy is supplied to a device, how much energy will the device give back?

View solution

Q. Materials which easily allow the passage of electric current are known as ______

View solution

Q. A wire of length 2m and another wire of length 5m are made up of the same material and have the same area of cross section, which wire has higher resistance?

View solution

Q. A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?

View solution

Q. Which of the following statements are true with regard to resistance?

View solution

Q. Which, among the following is a unit for resistivity?

View solution

Q. What is the resistivity of Copper?

View solution

Q. Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m² and 5m² respectively.

View solution

Q. Which of the following statements are true with regard to resistivity?

View solution

Q. The reciprocal of resistivity is________

View solution

Q. The resistance of pure metals ___________

View solution

Q. The resistance of insulators __________

View solution

Q. Which of the following statements are true about metals?

View solution

Q. Which of the following statements are true about insulators?

View solution

Q. What is the unit of temperature coefficient?

View solution

Q. A copper coil has a resistance of 200 ohms when its mean temperature is 0 degree centigrade. Calculate the resistance of the coil when its mean temperature is 80 degree centigrade. Temperature coefficient of copper is 0.004041 centigrade¯¹.

View solution

Q. The temperature of a coil cannot be measured by which of the following methods?

View solution