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प्रश्न
An Electric bulb is marked 100 W, 230 V. What find the energy consumed by the bulb in one hour.
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उत्तर
Energy consumed in Is is 100 J.
∴ Energy consumed in hour = 100 × 60 × 60J = 360000 J.
संबंधित प्रश्न
Which quantity has the unit of watt?
The unit for expressing electric power is:
(a) volt
(b) joule
(c) coulomb
(d) watt
The table below shows the current in three different electrical appliances when connected to the 240 V mains supply:
| Appliance | Current |
| Kettle | 8.5 A |
| Lamp | 0.4 A |
| toaster | 4.8 A |
- Which appliance has the greatest electrical resistance? How does the data show this?
- The lamp is connected to the main supply by using a thin, twin-cored cable consisting of live and natural wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.
- Calculate the power rating of the kettle when it is operated from the 240 V mains supply.
- A main takes the kettle abroad where the mains supply is 120 V. What is the current is the kettle when it is operated from the 120 V supply?
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.
Write the SI units for:
(a) Electric current
(b) Potential difference
(c) Charge.
Why is heating coil wound in the form of a helix in electric stove?
If the rating of an electric bulb is 100W – 230V, Explain its meaning.
Give two precautious that you would take while putting off an electric switch.
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:
