Internal Resistance of a Dry Cell

Physics Experiment Internal Resistance of a commute Cell May 16, 2009 Written by Daniel Chiuchiarelli 1. confine Contents cathode-ray oscilloscope Aim Equipment Method Results Discussion Conclusion 2. Background Ohms police force, a law that applies to galvanical circuits, states that if the temperature or impedance 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. Ein truth component of an electrical circuit offers some touchstone of resistance when an electrical burthen passes through it. Components such as light bulbs, resistances and motors all constrain the flow of current, and components such as wires and batteries, which are considered to have a theoretical resis tance of 0, in reality, have a very small level of resistance. By calculating the potential diametric and current across a component, we are able to reason the resistance due to Ohms law. 3. Aim To measure the indwelling resistance of a fresh and a flat dry-cell battery. 4.

Equipment might pack Voltmeter Ammeter SwitchConnecting wires Rheostat Dry-cell batteries 5. Method An electrical circuit was stack up with one battery as the power source, including an ammeter, transposition 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 approximatel y 1.5 A. The switch was closed, and the v! alues on the ammeter and voltmeter were besides 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 call for to get a full essay, order it on our website: OrderEssay.net

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