Lab 3: Measuring Voltage Differences in Circuits 1 Purpose This experiment is de
ID: 2078633 • Letter: L
Question
Lab 3: Measuring Voltage Differences in Circuits 1 Purpose This experiment is designed to illustrate how voltage is measured, and that it is always relative. 2 Background It is not possible to measure a voltage at one point and not refer to another (such as earth or ground voltage, or another point in a circuit). Often you will hear people talk about 'delta v (AV-Vf - Vi) which makes that voltage difference explicit. You wll see how important it is to understand this voltage difference concept once you complete the lab. 3 Methods & Materials You will use a web-based java simulation, individual items listed below, or the experiment kit to do this lab. The instructions as written assume that you have the experiment kit. If you are using the simulation or your own supplies, do the equivalent process with your set up. Web-Based Simulation 1. Go to phet.colorado.edu 2. Choose Play with simulations 3. Choose Physics, then Electricity 4. Open and download the Circuit Construction Kit (AC+DC) Physical digital multimeter 2 D-cell batteries ment Kit included included included ity...light bulbs connecting wires 3.1 Setting up the volt Set the voltmeter to measure DC voltages. (The simulation multimeter is already wired and ready to meteir V… Back wire Red wire 1-Plug the red probe lead into the rightrnost socket, labelled V 12 Hz. 2. Plug the black lead into the socket labelled COM.Explanation / Answer
1. In one bulb circuit as well as two bulb circuit the potential drop must be ZERO in a closed loop
2. In text book the potential drop in a closed loop can be calculated by Kirchoff's loop Law
3. In both the circuits the potential at positive terminal or at B point is maximum
4. There is sharp drop in the voltage when we move across a cell from positive terminal to negative terminal
5. There is steep rise in the potential when we move from negative terminal to positive terminal
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