Lab 3: Measuring Voltage Differences in Circuits 1 Purpose This experiment is de
ID: 2078632 • Letter: L
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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.
As per kirchoff's law round trip voltage in one bulb circuit as well as two bulb circuit must be ZERO
2.
In the text we always refer kirchoff's Loop Law to find the round trip voltage
3.
at positive terminal of the cell potential is maximum in the circuit while at the negative terminal the potential is always minimum
4.
across the cell or battery there is sharp drop in the voltage
5.
potential will have steep rise when we move across the cell from its negative terminal to its positive terminal
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