The circuit in figure shows two cells connected in opposition to each other. Cell E1is of emf 6 V and internal resistance 2 Ω; the cell E2 is of emf 4 V and internal resistance 8 Ω. Find the potential difference between the points A and B.
This is a Short Answer Type Questions as classified in NCERT Exemplar
Explanation-
total resistance = 2+8= 10 ohm
I= = 0.2A
The direction of flow of current is always from high potential to low potential
If VB VA
VB-4V-0.2 8 = VA
VB-VA= 3.6V
<p>This is a Short Answer Type Questions as classified in NCERT Exemplar</p><p>Explanation-</p><div><div><picture><source srcset="https://images.shiksha.com/mediadata/images/articles/1742968673phpCq9N45_480x360.jpeg" media=" (max-width: 500px)"><img src="https://images.shiksha.com/mediadata/images/articles/1742968673phpCq9N45.jpeg" alt="" width="244" height="129"></picture></div><div><p><strong> </strong>total resistance = 2+8= 10 ohm</p><p>I= <math><mfrac><mrow><mrow><mn>6</mn><mo>-</mo><mn>4</mn></mrow></mrow><mrow><mrow><mn>2</mn><mo>+</mo><mn>8</mn></mrow></mrow></mfrac></math> = 0.2A</p><p>The direction of flow of current is always from high potential to low potential</p><p>If VB <math><mo>></mo></math> VA</p><p>VB-4V-0.2 <math><mo>*</mo></math> 8 = VA</p><p>V<sub>B</sub>-V<sub>A</sub>= 3.6V</p></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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