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संबंधित प्रश्न
Name the commercial unit of electric energy.
When an electric lamp is connected to 12 V battery, it draws a current of 0.5 A. The power of the lamp is:
(a) 0.5 W
(b) 6 W
(c) 12 W
(d) 24 W
At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulb could be switched on in the house at the same time (if they are all connected in parallel)?
An electric bulb, when connected across a power supply of 220 V, consumes a power of 60 W. If the supply drops to 180 V, what will be the power consumed? If the supply is suddenly increased to 240 V, what will be the power consumed?
The diagram above shows a circuit with the key k open. Calculate :
(i) the resistance of the circuit when the key k is open.
(ii) the current drawn from the cell when the key k is open.
(iii) the resistance of the circuit when the key k is closed.
(iv) the current drawn from the cell when the key k is closed.
What changes in energy occur in an electric heater?
How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate total current taken from the supply.
How can electric energy consumed by an electric appliance be calculated in kilowatt hour (kWh)?
