EMF and Internal Resistance Lab Report Example | Topics and Well Written Essays - 1750 words

EMF and Internal Resistance - Lab Report Example This paper describes electric current as the manner in which the electric charge flow in a circuit in order to transfer energy portions to regions of resistance like resistors, buzzers, or bulbs) in the circuit. The circuit gets the energy at the start of the circuit where dry cells are producing electrical energy from chemical energy. The batteries available in today’s markets are mostly constructed from materials that possess negligibly small internal resistance. Real batteries do not only provide voltage to the circuit but they also offer some internal resistance. Any device that produces the voltage purely is called an electromotive force (E.M.F.) Which battery is the total energy that is changed electrical energy during the passage of a unit charge through the production point? It forms a voltage and reflects the total amount of energy supplied through the circuit. The terminal voltage a battery produces at a point without the flow of current is the EMF. The units for mea suring EMF is volts. All batteries/cells lose energy as heat when they are dissipating current because of the presence of their internal resistance. The voltmeter is used in the circuit to get the emf values. The addition of a resistor in the circuit drops the reading on the voltmeter voltage, v. Meanwhile, voltage does not experience full transfer in the circuit but a portion of it is wasted due to the presence of internal resistance within the battery. The dry cell only possesses internal resistance which converts the energy present into heat. The dry cells EMF together with its internal resistance can alternatively be calculated by other methods. A plot of terminal voltage versus current can help achieve the above. V varies inversely with changes in I to produce a straight line graph. The line equation of y=mx+c, is applicable to the formula of electromotive force, E= Ir.

Customer behaviour in charity retailing in UK Dissertation

Customer behaviour in charity retailing in UK - Dissertation Example Shopping in charity stores has seen a revived popularity with the emergence of the recession and the popularity of conservation style living. The reasons and drives that consumers feel to enter into thrift stores are varied and interesting as they reflect psychologies about the past as much as modern aesthetics. The emergence of the charity thrift store can be traced to the Salvation Army in London where the store was created in order to give some of those who were unemployed a job, the sale of the items supporting the wages for those collecting the goods. The desire for vintage style and the added bonus of conservation through repurposing has placed the charity store back into the lists of retail outlets being used by modern consumers. 1.2 Background With the emergence of the recession and the consequential focus on conservative spending, charity retailing has become a more significant resource from which to replenish needs and wants. Through items that have been donated by others for sales to benefit charities, revitalization can be found through new owners who can repurpose the items for their own uses. Changes in the retail environment are being reflected through the concept of repurposing. Green technologies and products that are designed for natural, organic, or socially responsible consumerism can be seen as examples of the type of retailing that is designed to provide a sustainable responsibility in consumer behaviour. ... The emergence of the charity thrift store can be traced to the Salvation Army in London where the store was created in order to give some of those who were unemployed a job, the sale of the items supporting the wages for those collecting the goods. The desire for vintage style and the added bonus of conservation through repurposing has placed the charity store back into the lists of retail outlets being used by modern consumers. 1.2 Background With the emergence of the recession and the consequential focus on conservative spending, charity retailing has become a more significant resource from which to replenish needs and wants. Through items that have been donated by others for sales to benefit charities, revitalization can be found through new owners who can repurpose the items for their own uses. Changes in the retail environment are being reflected through the concept of repurposing. Green technologies and products that are designed for natural, organic, or socially responsible co nsumerism can be seen as examples of the type of retailing that is designed to provide a sustainable responsibility in consumer behaviour (Krafft and Mantrala 2010). Consumer behaviours have changed in the last five years as the economy has dived into a recessive cycle. How money is spent is much more closely guarded, thus creating a more conscientious consumer. Items that can be repurposed and given a new function within the hands of a new consumer provides a sense of fulfilment as consumers find themselves trying to find ways to make ends meet. In addition, the charitable concept of buying in a store that is designed to benefit those in need is appealing to the consumer as the trends have been seen to support the evolution of more responsible living. The history of charity