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प्रश्न
Name two safety devices which are connected to the live wire of a household electric circuit
उत्तर
Fuse, MCB Switch
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संबंधित प्रश्न
The unit for expressing electric power is:
(a) volt
(b) joule
(c) coulomb
(d) watt
Which of the following is likely to be the correct wattage for an electric iron used in our homes?
(a) 60 W
(b) 250 W
(c) 850 W
(d) 2000 W
A current of 2 A is passed through a coil of resistance 75Ω for 2 minutes. (a) How much heat energy is produced? (b) How much charge is passed through the resistance?
Two bulbs are rated 60 W, 220 V and 60 W, 110 V respectively. Calculate the ratio of their
resistances
An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.
A simple electric circuit has a 30 V battery and a resistor ot 60 o. What will be the current in the circuit? The resistance of the oonnecting wires is negligible.
State relative advantages and disadvantages of ring system of wiring over the tree system.
A torch bulb is rated at 3 V and 600 mA. Calculate it’s
- power
- resistance
- energy consumed if it is used for 4 hours.
What is the meaning of electric power of an electrical device? Write its SI unit.
