A heater is marked with 220 V-1.5 kW. What is the resistance of (a heater? What will be the maximum current flow through the her) The if it is connected with 220 line
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Answer:
For a heater rated at 4 KW and 220 V, calculate
(I) the current.
(ii) the resistance of the heater
(iii) the energy consumed in two hours
(iv) the cost if 1 kWh is priced at Rs. 1.5
2. An electric bulb is rated as 50 W, 220 V. Calculate the energy consumed by the bulb in 20 minuted. Express the answer in commercial unit of electrical energy.
3. Two lamps one rated 60 W ar 220 V and other 40 W at 220 V are connected in parallel to electric supply at 220 V.
(I) Draw the circuit diagram to show the connection.
(ii) Calculate the current drawn from the electric supply.
(iii) Calculate the total energy consumed by the two lamps together when they operate
for 1 hr.
4.Two room heaters are marked 220 V , 500 W and 220 V, 800 W respectively. If the heaters are connected in parallel tp 220 V main supply. Calculate
(I) the current drawn by each heater.
(ii) the resistance of each heater.
(iii, tital electrical energy in commercial unit if they operate simultaneously for 2 hours.
5. Out of 60 W and 40 W lamps which one has a higher electrical resistance when in use.
6. Two identical resistors each of resistance 10 Ohm are connected in series and in parallel in turnto a battery of 6 V. Calculate the 3atio of power consumed in the combination of resistor in two cases.
Answer:
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