Advertisements
Advertisements
प्रश्न
The resistance of filament of an electric heater is 500 Ω It is operated at 200V for 1 hour daily. Calculate the current drawn by the heater and the energy consumed in kWh, by the heater in a month of 30 days.
Advertisements
उत्तर
Given: R= 500 Ω, V = 200 volt.
Total time = t = 1 × 30h = 30h = 30 × 60 = 60 s = 108000s.
Current drawn by the heater I = `"V"/"R" = 200/500 = 0.4` A
The energy consumed (in kWh) =`("voltage" xx "Current")/100 xx "Time"`
`= (200 xx 0.4)/1000 xx 30` = 2.4 kWh.
संबंधित प्रश्न
What is the SI unit of (i) electric energy, and (ii) electric power?
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long would it have taken if the supply voltage had fallen to 200 V?
An electric bulb, when connected across a power supply of 220 V, consumes a power of 60 W. If the supply drops to 180 V, what will be the power consumed? If the supply is suddenly increased to 240 V, what will be the power consumed?
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.
How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
An electric iron is rated at 230 V, 750 W. What is its resistance? What maximum current can be passed through it?
What is the commercial unit of electrical energy? Represent it in terms of joules.
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 ______
