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प्रश्न
Conceptual question.
A bird sitting on a high power electric line is still safe. How?
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उत्तर
Birds don’t get shocked when they sit on electrical wires because they are not good conductors of electricity. Electricity flowing through a single power line at 35,000 volts will continue along the path of least resistance and bypass birds, because there is no difference in electrical potential.
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संबंधित प्रश्न
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:
| V (volts) | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 |
| I (amperes) | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 |
Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.
State whether a voltmeter has a high resistance of a low resistance. Give reason for your answer.
The unit for measuring potential difference is:
Ohm's law state a relation between potential difference and ___________.
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.
An electric bulb draws 0.5 A current at 3.0 V. Calculate the resistance of the filament of the bulb.
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance of 10m long wire of the same material but the double radius.
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance if the wire is stretched to double its length?
100 J of heat is produced each second in a 4 Ω resistor. The potential difference across the resistor will be:
Name the instrument which is used to measure the potential difference.
