Advertisements
Advertisements
प्रश्न
An electric appliance is rated at 1000 W, 250V. Calculate:
(i) The electrical energy consumed by the appliance in 12 hour.
(ii) The cost of energy consumed at Rs. 1.20 per kWh.
How long would this appliance take to use 1 kWh energy when operated at 250 V?
Advertisements
उत्तर
Given: P = 1000W, V = 250V, t = 12 hr
(i) Electrical energy consumed = `"Watt"/1000 xx "time" ("in hr.")`
`= 1000/1000 xx 12` = 12 kWh
(ii) Cost = 12 × 1.20 = Rs. 14.40
If it takes t hour to consume 1 kWh electric energy, then:
I = `(1000xx"t")/1000`
or t = 1 hr.
संबंधित प्रश्न
An electric bulb is connected to a 220 V power supply line. If the bulb draws a current of 0.5 A, calculate the power of the bulb.
At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulb could be switched on in the house at the same time (if they are all connected in parallel)?
1kWh = …….. J
An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.
Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power source.
Define Kilo watt hour.
Why is heating coil wound in the form of a helix in electric stove?
Point out two main disadvantages of ‘Tree System’.
An electric iron is rated at 230 V, 750 W. What is its resistance? What maximum current can be passed through it?
1 mV is equal to:
