1: Measuring Voltage and Current Drag and drop one 2 Q resistor into the work area (if you right click on a resistor, you can change its resistance) and two light bulbs into your work area. Construct the circuit shown on the right, consisting of two light bulbs (with the same resistance) in series with a battery. (The resistor R will be added later). Increase the voltage across the battery to 20 V (right click on the battery to change its voltage) 1.What will happen to the current drawn from the battery when you place a (R = 2 0) resistor in parallel with bulb #2 as shown in the diagram? Explain your reasoning.
1: Measuring Voltage and Current Drag and drop one 2 Q resistor into the work area (if you right click on a resistor, you can change its resistance) and two light bulbs into your work area. Construct the circuit shown on the right, consisting of two light bulbs (with the same resistance) in series with a battery. (The resistor R will be added later). Increase the voltage across the battery to 20 V (right click on the battery to change its voltage) 1.What will happen to the current drawn from the battery when you place a (R = 2 0) resistor in parallel with bulb #2 as shown in the diagram? Explain your reasoning.
Chapter7: Electricity
Section: Chapter Questions
Problem 1MIO
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Transcribed Image Text:1: Measuring Voltage and Current
Drag and drop one 2 Q resistor into the work area (if you right click on a resistor, you
can change its resistance) and two light bulbs into your work area.
R
Construct the circuit shown on the right, consisting of two light bulbs (with the same
resistance) in series with a battery. (The resistor R will be added later). Increase the
voltage across the battery to 20 V (right click on the battery to change its voltage)
1
2
V
1.What will happen to the current drawn from the battery when you place a (R = 2 Q) resistor in parallel
with bulb #2 as shown in the diagram? Explain your reasoning.
2. Measure the voltage difference across the battery, and then place an ammeter in the
circuit such that you can measure the current drawn from the battery. Measure and record
the battery voltage difference and current here. Look at the figure as an example if you
are not sure how the circuit should look like.
Current:74 A
Voltage 20 V
2: Computing the Resistance of a Light Bulb
Build a circuit consisting of a battery in series with a 15 Q resistor and one light bulb (see Figure below).
150
ight bulb
1. Set the voltage difference across the battery to 30 V. Using the voltmeter with needle probes, measure
the voltage difference (VBATT) across the battery, the voltage difference (VR) across the 15 Q resistor, and
the voltage difference (VBULB) across the light bulb. What is the relationship between the three measured
voltage differences VB, VBULB, and VBATT? A values are roinded in this question to two
significant dizts.
VBATT
VBULB12V
VR18 V
Relationship:We know that with a junction the voltage enter must be equal Dhe voltage leave the
Junction so VBATT VBULB+VR
Simulation created by the Physics Education Technotogy-Project (PHET) c/o The University of Colorado at Boulder http://phet.colorado.edu/
This lab has been modified for the On-line lab course from "Electricity and Magnetism", 3rd Ed. Sokotoff, tawS-and Thornton for UNCC labs
1102L/2102L.
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