Two cells of voltage 10 V and 2 V, and internal resistances 10 Ω and 5 Ω respectively, are connected in parallel with the positive end of 10 V battery connected to negative pole of 2 V battery (figure). Find the effective voltage and effective resistance of the combination.
Applying kirchhoff's rule in outer loop containing 10V cell
10= IR+10I1……………. (1)
Applying kirchhoff's rule in outer loop containing 2V cell
2= 5I2-RI= 5 (I1-I)-RI
4= 10I1-10I-RI………… (2)
From 1 and 2
6=3RI+10I
2=I (R+10/3)
V= I (R+Reff)
After comparing V=2V, Reff= 10/3 ohm
Since effective internal resistance Reff of two cells 10/3 ohm, being the parallel combination 5 ohm and 10 ohm . the equivalent circuit is
<p>This is a Long Answer Type Questions as classified in NCERT Exemplar</p><p><strong>Explanation- </strong>applying kirchhoff's junction rule I<sub>1</sub> = I+I<sub>2</sub></p><p>Applying kirchhoff's rule in outer loop containing 10V cell</p><p>10= IR+10I<sub>1</sub>……………. (1)</p><p>Applying kirchhoff's rule in outer loop containing 2V cell</p><p>2= 5I<sub>2</sub>-RI= 5 (I<sub>1</sub>-I)-RI</p><p>4= 10I<sub>1</sub>-10I-RI………… (2)</p><p>From 1 and 2</p><p>6=3RI+10I</p><p>2=I (R+10/3)</p><p>V= I (R+R<sub>eff</sub>)</p><p>After comparing V=2V, R<sub>eff</sub>= 10/3 ohm</p><p>Since effective internal resistance R<sub>eff</sub> of two cells 10/3 ohm, being the parallel combination 5 ohm and 10 ohm . the equivalent circuit is</p><div><div> </div></div>
According to this chapter, a galvanometer is used to find and measure the small electric currents in a circuit. The principle that works in a galvanometer is the electromagnetic induction.
There are two types of electricity - Static and Current electricity. The electric charges buildup on a material's surface is called the static electricity. The continuous flow of electric charge is termed as the current electricity. Current electricity is of two types - Alternating Current (AC) and Direct Current (DC). In AC, the charge direction reverses periodically and in DC, charge flows in one direction.
In simple words, current electricity can be defined as the electric charge continuously moving from one place to another along a pathway. It is measured in amperes (A). Electric current is needed for electrical devices to work.
No, in fact, it is one of the easiest chapter of class 12 Physics. Other chapters which are considered comparatively easy are Ray Optics and Electric Charges and Fields.
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