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What is one kilowatt hour?...

What is one kilowatt hour?

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One kilowatt hour is the electric energy used in one hour by an electrical appliance of power one kilowatt. It is equal to `3.6 xx 10^(6)` J.
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How many joules are there in one kilowatt-hour?

(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.

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How many joules are present in 1 kilowatt hour? Also derive numerically

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NAVNEET PUBLICATION - MAHARASHTRA BOARD-EFFECTS OF ELECTRIC CURRENT -Answer the following questions :
  1. State the formula for electric power. Hence, obtain its SI unit.

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  2. What is the commercial unit of electric energy? Obtain the relation be...

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  3. What is one kilowatt hour?

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  4. What is heating effect of electric current? What is its origin?

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  5. Statement 1: Electric current (flow of electrons) creates heat in a re...

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  6. State Joule's law about heating effect of electric current.

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  7. Obtain the mathematical expression for the heat generated in a metalli...

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  8. Two dissimilar bulbs are connected in series. Which bulb will be brigh...

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  9. Name any six domestic appliances whose working is bases on the heating...

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  10. State applications of heating effect of electric current.

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  11. Explain the application of heating effect of electric current in an el...

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  12. Tungsten is used to make a solenoid type coil in an electric bulb.

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  13. Explain the application of heating effect of electric current in the e...

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  14. Take any electricity bill of your home. In the bill there is one table...

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  15. Name the types of wires or cables used the electric power supply provi...

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  16. In a domestie electrie supply in India, what is the potential differen...

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  17. Name the type of wire to which the main fuse is connected.

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  18. What does the electricity meter measure?

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  19. Is the electric potential difference across each appliance (in a domes...

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  20. Name the types of wire across which an electric appliance is connected...

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