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Procedure:Please ensure you have an updated Internet browser (e.g., Microsoft Edge, Internet Explorer 11, Firefox or Chrome).We will use the free simulation provided by the University of Colorado, Boulder Open the simulation by Ctrl + clicking on the link below:(or, you can copy-paste the following link into the address bar of your browser)Click on the picture of “Circuit Construction Kit: DC-Virtual Lab” to open the animation.After the animation opens, you should see the screen shown below.We can drag items from the panels on the left and on the right, and place them in the center of the screen using the left mouse button.Figure 1: Animation screen2Drag circuit elements with the mouse, andplace them in the middle of the screen
Part 1: A simple Circuit: Measuring VoltageWe will first construct a simple circuit consisting of a battery, light bulb and wires.Please drag the battery and light bulb and connect them with wires as shown below:Figure 2: Setting up a simple circuitAfter you connect the wires, electrons should start flowing in the circuit, creating an electric current. The battery supplies the energy needed for the electrons to flow. This electrical energy is converted to light and heat energy by the light bulb.We will now measure some properties of the circuit and record them in Table 1 below.Click on “Values” to select it. Figure 3: Selecting “Values”A) The values for the different components should now be displayed. Please enter the voltage ofthe battery, and the resistance of the light bulb in columns 1 and 2 of the Table 1 below.3
Table 1:Please complete the following table.Voltage (V) of Battery (in volts, V)Resistance (R)of Light Bulb(in 910B) Next, we will use the voltmeter to measure voltage across different elements in the circuit.Drag the voltmeter from the right panel to the middle of the screen. Connect the positive probe of the voltmeter (the red one) to the positive terminal of the light bulb as shown below. Connect the negative probe of the Voltmeter (the black one) to the negative terminal of the light bulb as shown below. Record the value of the voltage (V) measured by the voltmeter in Table 2 below.Table 2:Please complete the following table.Voltage (V) across Light Bulb (in volts, V) 9Note: if you switch the order of the probes, then the voltmeter will display the same number, but with a negative sign. This negative sign just indicates that the voltage is being measured in the opposite direction to the normal convention or the normal way voltage is usually measured.Figure 4: Measuring voltagewith a Voltmeter)4
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Physics, Resistor, Electrical resistance, Series and parallel circuits