Class -10th Subject:- Physics
Chapter -Electricity
Part A (1st 10 Questions)
Solution of all questions given below :-
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Solutions :-
1:- SI unit for electric charge -coulomb
No. Of electrons in 1 coulomb of charge - 6.25×10^18
2. SI unit of current is ampere
3. To measure the current use ammeter
Which is placed in series .
A series connection is used because objects in series have the same current passing through them.
4. miliampere (1mA=10^-3 A).
microampere (1uA=10^-6 A).
5. Because of coulomb force .
6. a) Electric cell involves conversion of chemical energy to electrical energy.
b) Electric torch involves conversion of electrical energy into light and heat energy.
7. Electric potential difference between two points in a circuit is the work done to move the charge from one end to the other end of the circuit.
8. The SI unit of electric potential is the volt, which is defined as a joule per coulomb.
9. Voltmeter is used to measure the potential difference between two points in a circuit.it is connected in parallel in the circuit.
Voltmeters do not have infinite resistance, but their resistance must be as high as possible to avoid taking up current.If the meter is connected in series, it will block the flow of current due to its high resistance, in effect killing the circuit. By connecting it in parallel, most of the current will flow through the circuit, with the tiny bit diverted through the meter allowing measurements to be made.
10. It's ohm's law, which states that the current flowing through a conductor is directly proportional to the potential difference applied across its ends, keeping the temperature and other physical condition unchanged
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