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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
A battery of emf 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively joined in series.
Find:
1) Current in the circuit
2) The terminal voltage of the cell
3) The potential difference across 6Ω Resistor
4) Electrical energy spent per minute in the 4Ω resistor.
Which device is used to measure p.d?
What is the ratio of potential difference and current known as?
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(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
Which one of the following is the correct set-up for studying the dependence of the current on the potential difference across a resistor and why?
Two bulbs are marked 100 W, 220 V and 60 W, 110 V. Calculate the ratio of their resistances.
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 doubled itself.
Name a device that helps to maintain a potential difference across conductors.
