Advertisements
Advertisements
Question
How many joules are there in one kilowatt-hour?
Advertisements
Solution
1 kilowatt-hour = 36,00,000 joules
APPEARS IN
RELATED QUESTIONS
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be ______.
Which quantity has the unit of watt?
A bulb is rated as 250 V; 0.4 A. Find its : (i) power, and (ii) resistance.
Write the formula for electric power in terms of potential difference and current.
A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor will ______________ .
An electric bulb marked 220 V, 100 W will get fused if it is made to consume 150 W or more. What voltage fluctuation will the bulb withstand?
What is wrong with the circuit diagram (Fig. 34)? Carefully check the symbols and assign proper positive and negative signs to them.
Name the physical quantity which is measured in kW.
Two resistors A and B of 4 Ω and 6 Ω, respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate the power dissipated in each resistor.
Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?
What does the unit kilowatt hour measure? Define it.
An electric filament lamp is connected to a supply of voltage higher than the recommended value. Give reasons, why compared with a normal performance, the lamp emits a brighter light and its life is shortened.
What is the function of the split rings in a d.c. motor?
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
A family uses a light bulb of 100W, a fan of 100W, and a heater of 1000W, each for 8 hours a day. If the cost of electricity is Rs. 2 per unit, what is the expenditure to the family per day, on electricity?
An electric bulb is rated as 100W – 250V. What information does it convey? Calculate the current through the filament of the bulb.
Using a long extension cord in which each conductor has a resistance of 8Ω, a bulb marked as '100 W, 200 V' is connected to a 220 V dc supply of negligible internal resistance as shown in the figure. The power delivered to the bulb is ______ W.
Two heaters A and B have power rating of 1 kW and 2 kW, respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is ______
