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Y. Why does electric current flow in a conductor when a potential difference is applied across its ends?
Why is an ammeter likely to be burn out if you connect it in parallel?
3. The power rating of an appliance is 100W-250V.What does it signify?
4. 'n' resistors each of resistance Rare connected in parallel in an electric circuit. What is the total effective
resistance of the circuit
5. What is an equivalent resistance of parallel connection ?
Answer question Nos. 6 - 9 in about 30 words :-
6. An electric appliance is marked 'P' watt & V' volt. If it is connected to the main of Vo' volt. Show that it's new
Power is given by
Po = (Vo/V)?P
7. A wire of resistance 10 ohm is bent in the form of a closed circle. What is the effective resistance between
two points at the ends of any diameter of the circle ?
8. Show that the power consumed by an appliance , when the applied voltage is 1/N of rated voltage is 1/N?
Of the rated power.
Show that one ampere of electric current is equivalent to a flow of 6.25 x 1018 elementary charges.
( Charge of one electron = 1.6 x 10-1°c) e
Answer question nos. 10 -13 in about 60 words :-
10. A heater of resistance Rand rated voltage V generated H amount of heat energy per second. If the heater
is connected to another source of electricity giving voltage V/10, find the heat produce per second.
11. An electric heater is marked 1500W - 220V. How long could be used for Rs. 20, If the electric energy cost
For Rs. 2.50 a unit ?
12. Give any three reason of preferring parallel combination for domestic wiring ?
13. Three resistance R1, R2 and R3 are connected in parallel. Determine their equivalent resistances,
14. i) Deduce an expression for the heat produced in a resistor when voltage drop across it is V
ii) Further mention the range of resistivity of good conductors
iii) How does the resistance of a wire or conductor change with temperature ?
Answers
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12th
Physics
Current Electricity
Drift Velocity & Mobility
When a potential difference...
Physics
When a potential difference is applied across the ends of a linear-metallic conductor:
Hard
Answer
In absence of any electric field the electrons are moving randomly , colliding with each other and again attaining a random velocity , but when we apply an external electric field the randomness is little controlled and electrons tend to attain velocity in the direction opposite to the applied electric field although their is random collision making it's velocity zero after random intervals but summing up all this give that electrons on an average attains a drift velocity in the direction of high potential.
Answer verified by Toppr