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प्रश्न
Mention three uses of the carbon arc.
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उत्तर
(i) They are used in light houses.
(ii) They are used in search lights and cinema projection appliances.
(iii) They are used in electric furnace and electric welding.
संबंधित प्रश्न
Define Electric power.
What determines the rate at which energy is delivered by a current?
1 kWh = ________ J
Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.
An electric fan runs from the 230 V mains. The current flowing through it is 0.4 A. At what rate is electrical energy transferred by the fan?
An electric bulb is rated 250 W, 230 V. Calculate:
- the energy consumed in one hour
- the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.
Name the physical quantity which is measured in kW.
What is ‘Rating’ of an electric appliance?
A student wants to use an electric heater, an electric bulb and an electric fan simultaneously.
How should these gadgets be connected with the mains? Justify your answer giving three reasons.
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 ______
