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प्रश्न
The power of an electric device is a product of ______ and ______.
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उत्तर
The power of an electric device is a product of electric current and the potential difference.
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संबंधित प्रश्न
A student made an electric circuit shown here to measure the current through two lamps.
Are the lamps in series or parallel?
(a) Are the lamps in series or parallel?
(b) The student has made a mistake in this circuit. What is the mistake?
(c) Draw a circuit diagram to show the correct way to connect the circuit. Use the proper circuit symbols in your diagram.
Draw a circuit diagram showing two lamps, one cell and a switch connected in series.
How can you change the brightness of the lamp?
A 720 W heater operates from a 220 V line voltage. Calculate:
(a) The electrical energy consumed by the heater in 3 h.
(b) The cost of electrical energy consumption at the rate of 60 paise per kWh.
Tick(✓) the correct choice in the following:
24 watt, 12 volt head lamp is fully lit by connecting it to a 12 volt
battery. The working resistance of the lamp is
Complete the following table. The first answer has been given as an example
| Quantity | Unit |
|
(a) Electrical potential Volt ( b) Resistance ( c) Power ( d) Energy ( e) Resistivity |
Volt ........ .......... ............ .............. |
What should I choose ___________________
b. for getting protection from electric current.
c. to measure the current in the circuit?
Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
What is meant by internal resistance of a cell?
State the condition when it is advantageous to connect cells in series.
