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प्रश्न
An electric bulb is rated ‘100 W, 250 V’. What information does this convey?
उत्तर
It means that if the bulb is lighted on a 250 V supply, it consumes 100 W electrical power, (which means 100 J of electrical energy is converted in the filament of the bulb into light and heat energy in 1 second).
संबंधित प्रश्न
Name the physical quality which is measured in
(i) Kw (ii) kWh
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V.
calculate:
(i) the resistance of the wire and
(ii) the heat energy produced in 1 minute.
Two resistors A and B of resistance 4 Ω and 6 Ω respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate: (i) the power supplied by the battery, (ii) the power dissipated in each resistor.
A potential difference of 6 V is applied across a 3 Ω resistor. What is the current flowinq throuqh the circuit?
Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?
State three factors on which the heat produced in a metallic wire due to passage of current in it depends.
Household wiring for lamp connections can either be done in parallel or in series.Which one would you prefer? Give a reason for your answer.
State relative advantages and disadvantages of ring system of wiring over the tree system.
A 100-watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. Calculate the energy consumed (in kWh) in the month of January.
What is the meaning of electric power of an electrical device? Write its SI unit.
