Question

find out the value of resistance​

Answer 1

Answer:

total resistance is 7 ohm

Explanation:

first Rs¹ => 10 ohm

than Rp¹ => 5 ohm

now Rp² => 1 ohm

then Rs² => 6 ohm

now Rp³ => 3 ohm

then Rp⁴ => 2 ohm

at last Rs³ => 7 ohm

Answer 2

$\underline{\textbf{QUESTION :-}}$

$\underline{\textbf{SOLUTION :-}}$

first Rs¹ => 10 ohm

than Rp¹ => 5 ohm

now Rp² => 1 ohm

then Rs² => 6 ohm

now Rp³ => 3 ohm

then Rp⁴ => 2 ohm

at last Rs³ => 7 ohm

$\boxed{\textsf{total resistance is 7 ohm}}$

$\mathcal {ANSWER}$ -total resistance is 7 ohm

$\underline{\textbf{EXTRA INFORMATION :-}}$

Resistance analogy

• The concept of resistance is not always easy to understand because it is not possible to visibly see the quantities involved: voltage, current and resistance itself are all rather invisible quantities tot he naked eye, although they can be detected and measured in a variety of ways.

• One analogy that helps introduce the concept of resistance is that of a water tank with a pipe leading down from it. Whilst we don't want to take the analogy too far it does help to explain the basic concept.

• Analogy of a water tank and pipe to illustrate the concept of resistance

• In this analogy, the water pressure caused but he height of the water is analogous to the voltage, the flow of water is analogous to the current, and the restriction of the water flow caused by the pipe is analogous to the resistance.

• Adding a tap reduces the water flow and this is analogous to increasing the resistance

• Adding a tap reduces the water flow and this is analogous to increasing the resistance

• It can be seen that if the pipe was narrowed, or a tap added, the water flow would be further restricted and less water would flow. This would be analogous to increasing the resistance in in an electrical circuit, and this would reduce the current flow.

• A simple circuit with a single resistor providing resistance

• In a simple circuit comprising of a battery or voltage source and a resistor, then assuming the connecting wires have no resistance, then the higher the resistance the less the current that will flow.

• The tap in the analogy of the water system corresponds to changing he resistance of the resistor. When the tap is off, then this is equivalent to a switch stopping any current flow into e electrical circuit.

Unit of Resistance

• From the definition of resistance, it can be said that the unit of electric resistance is volt per ampere. One unit of resistance is such a resistance which causes 1 ampere current to flow through it when 1 volt potential difference is applied across the resistance.

• The unit of electric resistance that is volt per ampere is called ohm(Ω) after the name of great German physicist George Simon Ohm.He is famous for his law called Ohm’s law which is applicable only on pure resistance. The unit ohm is normally used for moderate values of resistance but there may be a very large as well as a very small value of resistance used for different purposes.

• These values are expressed in giga-ohm, megaohm, kilo-ohm, milli-ohm, micro-ohm even in nano-ohm range depending on the value of resistance.

Unit Name Abbreviation Value in ohm (Ω)

Giga Ohm G Ω                    10⁹ Ω

Mega Ohm M Ω                    10⁶ Ω

Kilo Ohm K Ω                    10³ Ω

Milli Ohm m Ω                    10 ⁻ ³ Ω

Micro Ohm μ Ω                    10 ⁻ ⁶ Ω

Nano Ohm n Ω                    10 ⁻⁹ Ω

Resistance of Different Materials

• Depending on the resistance value substances are divided into three categories.

• There are some materials mainly metallic substances that offer very low resistance to the current through them. These substances are referred to as conductors more precisely electrical conductors. Silver is an extremely good conductor of electricity but it is not widely used in electrical systems because of its high cost. Aluminum is a good conductor and it is a commonly used conductor because of its low cost and plenty of availability. Copper is another good conductor commonly used in different electronics and electrical circuits and it is a better conductor than aluminum but at the same time, it is costlier than aluminum.

• There is another category of materials called semiconductor. These have a moderate value of resistance i.e. not very high as well as not very low at room temperature. There are endless uses of semiconductors for making electrons devices. Silicon, germanium are two mostly used semiconductor materials. In addition to these different compounds also behave as semiconductors.

• The materials offer extreme resistance to the current is known as the insulator or electrical insulation material. These materials are a very bad conductor of electricity and mainly used to prevent leakage current in electric systems. Papers, dry woods, mica, porcelain, glass epoxy-polyester, mineral oil, SF6 gas, Nitrogen gas, other gases, air, etc are very good examples of insulation materials.