Q22 of 72 Page 12

Define electric Power. What is its unit?

The rate at which electrical energy is consumed or dissipated is known as electric power. Electric power = = = I2 R. Its unit is watt.

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20 State the three factors on which the heat produced by an electric current depends. 21 What is resistance? How is resistance caused. What are the factors it depends? How does it vary with temperature? 23 An electric bulb is rated at 220V, 200W. What is its resistance? 24 A torch bulb is rated at 2.5V, 500 A. Find the power and resistance.