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प्रश्न
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उत्तर
Power-voltage rating of an electrical appliance indicates the value of voltage above which the appliance should not be used. It serves as a precaution to the customer and also helps to calculate the maximum value of current that can be safely passed through the appliance.
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संबंधित प्रश्न
Which particles constitute the electric current in a metallic conductor?
Name two effects produced by electric current.
60 joules of heat was dissipated in a resistor when 20 C flowed for 5 s. Calculate:
(a) P.d. across the resistor,
(b) Resistance of the resistor, and
(c) Average power dissipated in the resistor.
An electric oven is rated as 1.5 kW, 250 V. If it is connected to a 250 V mains, calculate the
(a) Current drawn,
(b) Energy consumed in 20 hours,
(c) Cost of energy consumed in 20 hours at the rate of Re. 1 per unit.
Calculate the current through a 60 W lamp rated 250 V. If the line voltage falls to 200 V, how is power consumed by the bulb affected?
An electric bulb is rated '100 W, 250 V'. How much current will the bulb draw if connected to a 250 V supply?
Which part of an electrical appliance is earthed?
What is the speed of electric current?
Name any two devices, which are working on the heating effect of the electric current.
