Voltage division, Physics

Assignment Help:

Voltage division:

In a series circuit Ohm's law applies for each component.  However, since the current is common to all components we have:

          V1 = IR1,  V2 = IR2,  V3 = IR3

          Therefore  V1 ∝ R1,  V2 ∝ R2,  V3 ∝ R3

          i.e.    Vn ∝ Rn

Hence the voltage drops across each resistor can be calculated from the ratio of the resistance values.

694_VOLTAGE DIVISION.png

It should also be noted, that for any given applied voltage we may derive any smaller voltages we wish by inserting resistors of the appropriate values in series. The following example shows how voltages of 8V, 4V and 24V can be derived from a 36V supply.

RTOTAL = 12 + 6 + 36 = 54W

  54Ω = 36V and 1Ω = 36/54V

  12Ω = 36/54 ´ 12 = 8V across AB

and  6W = 36/54 * 6 = 4V across BC

and  36Ω = 36/54 ´ 36 = 24V across CD

 

A device which employs voltage division and which is commonly used in electrical and electronic circuits is the potential divider.  Here two or more resistors are used to divide a given input voltage to achieve a specified output voltage.  See diagram.

220_VOLTAGE DIVISION1.png

The potential divider is also known as a voltage divider or scaling circuit.

Note that if current is drawn from the output then the effective resistance of the circuit changes and the output voltage vOUT changes.

 


Related Discussions:- Voltage division

A parallel plate capacitor each with plate area a, A parallel plate capacit...

A parallel plate capacitor, each with plate area A and separation d, is charged to a potential dissimilarity V. The battery used to charge it is then disconnected. A dielectric sla

Online take home quiz for undergrad physics class, Hi there, I have online ...

Hi there, I have online take home quiz tmr, just wondering if there''s a way that you guys can help me. I can take a screenshot of the questions and send it to you. I need the ans

What is the sum momentum of the combination object, Regard as two cars both...

Regard as two cars both moving eastward along a straight road. Car 1 is in facade of car 2. Car 1 has a mass of 1200 kg as well as a speed of 24 m/s. Car 2 has a mass of 1100 kg as

Uniform magnetic field, A positively-charged subdivision is moving southwar...

A positively-charged subdivision is moving southward in a downward-directed uniform magnetic field. The magnetic force is the merely force if any acting on the particle. Throughout

Cph has mass and velocity. what is its de broglie wavelength, CPH has mass ...

CPH has mass and velocity. What is its De Broglie wavelength? Answer; since I told before, the wavelength of CPH is equal of electromagnetic wavelength when it is growing.

Thermodynamics, The internal energy change when a system goes from state A ...

The internal energy change when a system goes from state A to B is 40 kJ/mole. If the system goes from A to B by a reversible path and returns to state A by an irreversible path wh

What is an effect wheel, What is an effect wheel? A disc of polycarbona...

What is an effect wheel? A disc of polycarbonate or metal revolving among the lamp and the common end along with holes, slits, patterns or colors.

Determine the change in the momentum of the ball, A girl throws a 0.1 kilog...

A girl throws a 0.1 kilogram ball at a wall.  The ball hits the wall perpendicularly with a velocity of 5 meters per second and then bounces straight back with a velocity of 4

Define hydrogen rocket, Define Hydrogen Rocket? The reaction chamber ...

Define Hydrogen Rocket? The reaction chamber of a rocket engine is supplied with a mass flow rate m of sufficient oxygen and hydrogen to allow complete burning of the fuel an

Solve quesn, Your friend has gifted an earphone set to you. While music is...

Your friend has gifted an earphone set to you. While music is on you will try to oppose the two ear phone pieces to attract. Task-I: Will they attract? If yes, why so? Task-II: Why

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd