Advertisements
Advertisements
Question
Conceptual question.
A bird sitting on a high power electric line is still safe. How?
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Name a device that helps to maintain a potential difference across a conductor.
By what other name is the unit joule/coulomb called?
What do you understand by the term "electric potential"? (or potential) at a point? What is the unit of electric potential?
How is a voltmeter connected in the circuit to measure the potential difference between two points? Explain with the help of a diagram.
A potential difference of 20 volts is applied across the ends of a resistance of 5 ohms. What current will flow in the resistance?
Why do electricians wear rubber hand gloves while working with electricity?
A current of 1.6 mA flows through a conductor. If charge on an electron is –1.6 × 10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.
Electric cells having 2V potential difference each have been connected in the form of a battery. What will be the total potential difference of the battery in both cases?
Find the resistance of a conductor if the electric current flowing through it is 0.35 A when the potential difference across it is 1.4 V.
Two bulbs are marked 100 W, 220 V and 60 W, 110 V. Calculate the ratio of their resistances.


