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प्रश्न
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उत्तर
P = VI = I2 R = `"V"^2/"R"`
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संबंधित प्रश्न
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
Name two gases which are filled in filament type electric light bulbs.
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.
A potential difference of 6 V is applied across a 3 Ω resistor. What is the current flowinq throuqh the circuit?
State (i) the S. I. unit, (ii) the household unit, of electrical energy. How are these units related?
An electric bulb is rated as 100W – 250V. What information does it convey? Calculate the current through the filament of the bulb.
An Electric bulb is marked 100 W, 230 V. What current does it take?
A bulb is marked 100W, 220V and an electric heater is marked 2000 W, 220 V.
(i) What is the ratio between the resistances of these two devices?
(ii) How does the power-voltage rating of a device help us to decide about the type of leads (connecting wires) to be used for it?
(iii) In which of the above two devices, a thicker connecting wire of lead is required?
A cooler of 1500 W, 200 volts and a fan of 500 W, 200 volts are to be used from a household supply. The rating of fuse to be used is:
