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प्रश्न
If the rating of an electric bulb is 100W – 230V, Explain its meaning.
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उत्तर
If an electric bulb is rated as 100W – 230V, it means that the bulb is lighted on a 230V supply, it consumes 100W electric power (i.e., 100J of energy per sec.).
संबंधित प्रश्न
Write an expression for the electrical power spent in flow of current through a conductor in terms of
(a) Resistance and potential difference, (b) current and resistance.
Name the physical quality which is measured in
(i) Kw (ii) kWh
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- the power of bulb and
- the potential difference at its end.
Name three main characteristics of an heating element.
What changes in energy occur in an electric heater?
What is the order of current drawn by appliances connected to the ‘power circuit’ of a household?
Give two precautious that you would take while putting off an electric switch.
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
Two bulbs are rated: bulb A 100W, 120 V bulb B 10W, 120 V. If both are connected across a 120V supply, which bulb will consume more energy, When in series? Also calculate the current through each bulb in above cases.
An overhead tank of capacity 10 k litre is kept at the top of building 15 m high. Water falls in tank with speed 5`sqrt2` m/s. Water level is at a depth 5 m below ground. The tank is to be filled in `1/2` hr. If efficiency of pump is 67.5% electric power used is ______ W.
