Question

Please answer the following questions both
Humble Request...
PSEB..
CLASS 10

Answer 1

b)the resistance of conductor depends upon length,area of cross section and the nature of material of which conductor is made its formula is
R= roh L/ A
a)the unit of current is ampere or coulomb per second . it is defined as a current due to flw of charge at the rate of one coulumb per second
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Answer 2

Resistors R1, R2, R3 are connected parallely. The voltmeter is connected parallely to the resistors. The resistors are connected in series with a battery, key and an ammeter. When the current starts to flow, notedown  the voltmeter and ammeter readings.

When the voltmeter's position is changed in the circuit, it reads the same i.e., V remains same. Connect the ammeter to R1, R2, R3 separately. Note down the ammeter reading as I1,I2 and I3.

I= I1+I2+I3⇒1st equation

From ohm's law,

I=V/R

Substitute I in 1st equation

V/R=V/R1 + V/R2 + V/R3

V/R=V{1/R1 + 1/R2 + 1/R3}

∴1/Rp = 1/R1 + 1/R2 + 1/R3

∴The reciprocal of the total resistance is equal to the sum of the reciprocal of the individual resistances.

a) Unit of electric current is Ampere.

One Ampere:- When one coulomb of charge flows in a second, then the current drawn is 1Amp.

b) Factors on which resistance of a conductor depend:-

• Length of the conductor
• Area of cross section of the material
• Nature of the conductor
• Temperature.

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