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संबंधित प्रश्न
What is the SI unit of (i) electric energy, and (ii) electric power?
The unit for expressing electric power is:
(a) volt
(b) joule
(c) coulomb
(d) watt
When a current I flows through a resistance R for time t, the electrical energy spent is given by:
(a) IRt (b) I²Rt (c) `IR^2t` (d) `I^2R ⁄t`
An electric toaster draws 8 A current in a 220 V circuit. It is used for 2 h. Find the cost of
operating the toaster if the cost of electrical energy is Rs. 4.50 per kWh.
Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power source.
A simple electric circuit has 24 V battery and a resistor of 60 Ω. What will be the current in the circuit? The resistance of the connecting wires is negligible.
Point out two main disadvantages of ‘Tree System’.
An immersion rod having resistance of 50 Ω is connected to 220V main supply. Assuming that all the energy generated goes to heat the water, calculate the time taken to heat 5 kg water from 30°C to 100°C.
What is the commercial unit of electrical energy? Represent it in terms of joules.
A electric bulb is rate 220 V, 60 W. its electric cell resistance is nearly
