Internal Resistance of a Dry Cell

Physics Experiment Internal Resistance of a shift Cell May 16, 2009 Written by Daniel Chiuchiarelli 1. confine Contents scene Aim Equipment Method Results Discussion Conclusion 2. Background Ohms police force, a law that applies to galvanical circuits, states that if the temperature or exemption of a device is constant, and an galvanic current is sent by it, then the current silky through will be directly proportional to the electric potential across it. In mathematical terms, I ∝ V. From this relation, the code V=IR was derived, where V is the electric potential, I is the current, and R is the resistance. E rattling component of an electric circuit offers some touchstone of resistance when an electrical snap passes through it. Components such as light bulbs, electric resistances and motors all shackle the flow of current, and components such as wires and batteries, which are considered to have a theoretical resistance of 0, in real ity, have a very small level of resistance. By calculating the potential divers(prenominal) and current across a component, we are able to purport the resistance due to Ohms law. 3. Aim To measure the immanent resistance of a fresh and a flat dry-cell battery. 4.

Equipment post pack Voltmeter Ammeter SwitchConnecting wires Rheostat Dry-cell batteries 5. Method An electrical circuit was plenteousness up with one battery as the power source, including an ammeter, substitution and variable resistor (rheostat) in series. A voltmeter was set up in parallel with the battery. The variable resistor was adjusted until the ammeter gave a reading of approximately 1. 5 A. The switch was closed, and the value! s on the ammeter and voltmeter were barely as fast as possible, in order to forefend the resistor heating up. The variable resistor was adjusted through 4 or 5 different resistors, and 4 or 5 voltage and current measurements were recorded. The experimental data was plan and analysed....If you want to get a full essay, order it on our website: OrderEssay.net

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