[" d) Unit of electric power may also be expressed as "],[" i) volt ampere "],[" ii) kilowatt hour "],[" iii) watt second "],[" iv) joule second "]

What is the SI unit of (i) electric energy, and (ii) electric power?

What is the SI unit of [i] electric energy, and [ii] electric power?

Of which physical quantity is the unit kilowatt hour? Define one kilowatt hour. Express it in joules.

The heat produced (in calories) in a resistance R when a current I amperes flows through it for t seconds is given by the expression

The heat produced (in calories) in a resistance R when a current I amperes flows through it for t seconds is given by the expression

The SI unit of power is? (a) Erg (b) Kilowatt (c) Joule (d) Watt

The electricity meter in the domestic electric circuit measures electrical energy consumption in kilowatt hours. Is it true? Also express 1 kilowatt hour in joules.

(a) What is meant by "electric power"? Write the formula for electric power in terms of potential difference and current. (b) The diagram below shows a circuit containing a lamp L, a voltmeter and an ammeter. The voltmeter reading is 3V and the ammeter reading is 0.5A. (i) What is the resistance of the lamp? (ii) What is the power of the lamp? (c) Define kilowatt-hour. How many joules are there in one kilowatt-hour? (d) Calculate the cost of operating a heater of 500 W for 20 hours at the rate of Rs 3.90 per unit.