Class -10th Electricity
Part -B
Subject :- Science
This post is for the students who are in class 10th and preparing board exam.
This post includes 10 Questions and their solutions. These 10 questions are from the chapter name Electricity.
First solve all Questions by our own and then match with our solution.
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Another 10 Questions and their
Solution are given below.....
1. Current only flows when a circuit is complete.
2. Resistance is the property of a conductor.
A resistor is a electrical component .
3. At constant temp. Resistance depends upon length , Area , Nature of material.
R= pL/A
5. Total potential difference across a combination of resistors in series is equal to the sum of potential difference across the individual resistors.
V = V1 + V2 + V3
Let I be the current in the circuit.
: The current through each resistor is also I.
Let equivalent resistor of resistance R.
Acc. To Ohm's law,
V = IR
On applying Ohm's law to the three resistors respectively we have
V1 = IR1
V2 = IR2
V3 = IR3
And V = V1+ V2 + V3
IR = IR1 + IR2 + IR3
R= R1 + R2 + R3
7. Ohm’s Law:- Law states that when current is passed between two points of a conductor, the current is directly proportional to the potential difference between two points.
Mathematically , Ohm's law is given by
I∝V
I= V/R
V=IR
Where v is the potential difference , I is the current and R is the resistance.
8. The amount of charge flowing from A to B in time t is given by,
Q = I x t [∵ I = Q / t]
As per the definition of potential difference,
Work done in carrying unit charge from A to B = V.
∴ Work done to bring charge Q from A to B is
W = V x Q
W = V x It
This amount of energy is expensed in overcoming the resistance offered by the resistor.
If whole of the energy is dispensed as heat, then the amount of heat produced is given by
⇒ H = VIt [∵ V = IR]
H = I²Rt
Joule's law of heating is represented by the above equation.
Joule's law of heating states that the amount of heat produced in a conductor is:
(i) directly proportional to the square of the current,
(ii) directly proportional to the resistance of the conductor, and
(iii) directly proportional to the time for which the current is passed.
9. Some applications based on heating effect of current are:-
1) Electric Fuse :--
2) Electric Iron :-
3) Bulb :-
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