Finding the Internal Resistance of a Power Pack
Aim
Design and Carry Out an experiment to determine the EMF and Internal
Resistance of a standard laboratory power pack.
Theory
This information was taken from the Collins advanced science Physics
textbook, the Cambridge Advance Science Physics 1 textbook and from
notes taken in class.
E.M.F or Electro Motive Force is the opposite of potential difference,
in that; it is the situation where a voltage is gaining energy. This
seems unlikely, but it is required in order to allow an electric
circuit to function. An electric current is a flow of electric charge,
the charge flows around the circuit, transferring some of its energy
to areas of resistance along the way (resistors, filament lamps,
buzzers). At some point along the way the energy must be initially
supplied, otherwise the whole process couldn't function. At the
beginning of the process the power supply provides the charge with
energy to pass to the circuit. This is the electro-motive force. EMF
is a type of voltage along with potential difference and these are
defined as:
A Voltage where the charge is losing energy is a potential difference,
V.
A Voltage where the charge is gaining energy is an electromotive force,
E.
A relationship exists between volts and joules. A 10v power supply,
for example, will give 10J of energy to each coulomb that it pushes
round the circuit. When a single coulomb passes through a component
with a p.d. of 5v, it transfers 5J of energy to the p.d. In it's
simplest form when 1C passes through a p.d. of 1v, it transfers 1v of
energy.
Power Supply
Resistor
[IMAGE]My investigation is concerned with the insides of the power
supply, commonly a power pack is made up of many wires, and a cell
contains chemical electrolytes and electrodes, both however work to
the same effect. When the charge passes through the source of e.m.f it
gains lots of energy, but also instantly loses some of that that it
The purpose of this lab was to calculate the specific heat of a metal cylinder
We are dependent on energy for almost everything in our lives. When the outside temperature rises a little, we immediately switch on the air conditioner to keep our house cool. This is using up of energy. We have starting taking things for granted and we have started wasting energy unnecessarily. Energy is limited and hence to maintain the quality of life, it is important that we use our energy resources wisely. If we do not conserve energy, the energy will exhaust and we will have nothing to use.
Sometimes a simple life event that occurs to most people and is not even noticed can mean so much more when put in a poem. In Taylor Gorman’s poem “Cut”, this is exactly what the author does. He takes a simple event like cutting yourself and then writes a poem and lets the reader imagine what it means or should mean. Most critics would agree that a poem that seems very simple on the outside may contain a much deeper meaning if studied in depth, as is the case with Robert Frosts, “A Road not Taken”. “’The Road not taken’ has always been extremely popular with readers and critics alike. On the surface, the poems premise is simple, but critics have examined the poem in detail and have discovered depths of meaning not apparent in casual reading.”(Lee 2) He begins with the simple cut, and what most people do afterwards, which is continue with their life and ignore it. “There is a cut in your face from shaving. You can feel it burn, but you don’t remember ever cutting yourself shaving. You have good skin, but there it is: a cut in your face from shaving. Still, you go about your day.” (Lines 1-3) However, the author after this takes it to the extreme which is the person becoming somewhat like a ghost in the end of the poem. This then gives this poem a possibility to have a much deeper meaning, such as maybe the cut means something different or just has a deeper meaning. The author’s use of
type of energy is lost or gained, and whether or not a factor that is
traveling this alternate route, the electrons form a current, ergo energy. Once the protons and
Investigating Heat Loss From a Container Planning We are investigating heat loss from a container and how it is affected. We could change: Room temperature Surface area Amount of water Use a lid Insulate around it Colour of tin We could measure / observe: Amount of time Temperature We will change: Surface area We will measure / observe: Temperature (every minute for 5 minutes) Our question is: Does surface area effect the rate of heat loss? We will keep these the same: Colour of tin Room temperature Amount of water Use a lid Insulate around it Preliminary investigation = == ==
NaOH(aq)Â Â Â Â Â Â Â Â +Â Â Â Â Â Â Â Â Â HCl(aq)Â Â Â Â Â Â Â Â Â Â Â Â Â Ã Â Â Â Â Â Â Â Â Â Â Â Â NaCl(aq) Â Â Â Â Â Â + Â Â Â H2O(l).
By getting to this power point it leaves the maximum potential energy. That potential energy is put into kinetic energy and the ball is thrown, ...
I also decided to use a wooden block to keep hold of the wire, because
Kinetic Energy: 1/2mv2=eV, where m is the mass of an electron, v is the electron speed, e is the elementary charge of an electron, and V was the voltage used in the experimental calculation.
CEO Johnston also has plans to bolster the company’s leadership with the best minds available and also use motivational techniques to invigorate his employees. These ideas show the character of the CEO in enhancing productivity from his work force.
Energy is a property of matter which can be transferred to other matters or transformed into different forms, although it cannot be created or destroyed. A common definition of energy is that it is the ability to do work. Work is the transfer of energy. Work is done on an object when energy is transferred to that object. If one object transfers energy to another object then the first object does work on the second object. Work is when a force is applied over a distance. To calculate work, find the dot product of an object’s displacement and the force applied. In SI units, energy is measured in joules (“Work, Energy and Power”, 2015).
According to Mr. Solar.com, “this type of energy production, known as the Photovoltaic Effect, is achieved by solar panels converting sunlight into energy. Solar panels are made up of several individual solar cells, composed of layers of silicon, phosphorous (which provides the negative charge), and boron (which provides the positive charge). Solar panels absorb the sunlight’s photons and by doing so initiate an electric current, producing electrons. The resulting energy generated from photons striking the surface of the solar panel allows electrons to be knocked out of their atomic orbits and released into an electric field generated by the solar cells, which then pull these free electrons into a DC or directional current.” This electricity then proceeds to a mechanical room beneath our house to a charge controller, which regulates the amount of energy sent to our 24V batteries to be stored.
Nike is a very large brand, due to its size its target consumer is usually very broad. The brand motto is “Just Do It” which is meant to target ordinary people, showing that anyone can be an athlete and encourage health. This links it back to the Health Conscious City Dwellers as some of them do not necessarily exercise regularly but the NikeFuel bracelet makes exercise a part of the consumer’s everyday activities. Nike is usually associated with achievers, they endorse elite athletes in order to reinforce this ideal but also utilize the idea that it is possible for anyone to achieve greatness with the right amount of work. The NikeFuel’s slogan is “Motivation on your wrist”, sticking with Nike’s ideals of always encouraging