Advertisements
Advertisements
प्रश्न
What is consumed using different electrical appliances, for which electricity bills are paid?
उत्तर
Electrical energy
APPEARS IN
संबंधित प्रश्न
In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours everyday. Calculate the electric consumed in 30 days.
An electric heater of resistance 8 Ω takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater.
Distinguish between kilowatt and kilowatt-hour.
What does the unit kilowatt hour measure? Define it.
The electric bulbs used these days have a coil-coiled filament. State its reason.
What is the function of the split rings in a d.c. motor?
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the resistance of each heater.
A bulb is marked 100W, 220V and an electric heater is marked 2000 W, 220 V.
(i) What is the ratio between the resistances of these two devices?
(ii) How does the power-voltage rating of a device help us to decide about the type of leads (connecting wires) to be used for it?
(iii) In which of the above two devices, a thicker connecting wire of lead is required?
Find the cost of operating an electric toaster for two hours if it draws 8 A current on a 110 volt circuit. The cost of electrical energy is Rs. 2.50 per kWh.
What is the commercial unit of electrical energy? Represent it in terms of joules.