Advertisements
Advertisements
प्रश्न
An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.
Advertisements
उत्तर
Given,
Power (P) = 2 kW,
Voltage (V) = 220V
Time (t) = 7 x 3 = 21 h
From relation,
E = P x t
Substituting the values in the formula above, we get,
E = 2 x 21 = 42 per kWh
Cost for 1 kWh of energy = ₹ 4.25
Total cost for 42kWh of energy = 4.25 x 42 = ₹ 178.50
APPEARS IN
संबंधित प्रश्न
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
When current is switched ‘on’ in a room heater, it ______.
The elements of electrical heating devices are usually made of:
(a) tungsten
(b) bronze
(c) nichrome
(d) argon
Statement 1 : Electric current ( flow of electrons ) creates heat in the resistor.
Statement 2 : Heat in the resistor is created according to the rule of energy conservation.
Explain Statement 1 with the help of Statement 2.
Name any two appliances which works on the phenomenon of heating effect of electric current.
When does overloading occur?
Name any two appliances which work under the principle of heating effect of current.
An electric iron draws a current of 4 A when connected to 220 V mains. Its resistance must be:
An MCB can be used instead of a fuse in an electrical circuit.
Explain why fuse wire is always connected in a series arrangement.
