Overview
Drag out two batteries. Measure the voltage of each. Then use a wire to connect the two batteries, end to end. Measure the voltage across both batteries.
[Image unavailable: Lab_Voltage.png]
What happens to the voltage when the two batteries are connected?
Group of answer choicesIt doublesIt triples
It doesn't change
It is reduced by half
Flag question: Question 2Question 21 pts
Drag out three batteries. Measure the voltage of each. Then connect the three batteries, end to end. Measure the voltage across all three batteries.
What happens to the voltage when the three batteries are connected?
Group of answer choicesIt triplesIt doubles
It stays the same
It is reduced by one third
Flag question: Question 3Question 31 pts
Construct a circuit with a battery and a light bulb.
For example:
[Image unavailable: Lab_VoltageLightBulb.png]
How does the voltage of the battery compare to the voltage of the light bulb?
Group of answer choicesIt is about the sameIt is higher for the battery
It is lower for the battery
Flag question: Question 4Question 41 pts
Vary the voltage. How does this affect the brightness of the light bulb?
Group of answer choicesThe higher the voltage the brighter the bulbThe lower the voltage the brighter the bulb
The voltage doesn't affect the brightness of the bulb
Flag question: Question 5Question 52 pts
What do you think causes the changes in the brightness of the bulb?
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Light bulbs in Series
Build the circuits shown below, with a battery of about 12 V ( line with + -) and light bulbs (circles).
Fill in the table.
In a few sentences, explain what you observed and why you think this is happening.
[Image unavailable: Lab_VoltageSeries1.png]
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Light Bulbs in Parallel
Build the circuits shown below, with a battery of about 12 V and light bulbs. Make a table and fill it in.
In a few sentences, explain what you observed and why you think this is happening.
[Image unavailable: Lab_VoltageParallel1.png]
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Resistors in Series
Construct the Circuit shown in Figure 1 below. Make the resistors have different values and record the value of each resistor in the table. Move the Ammeter (A) to take current readings in different places, as shown in Figure 2. Then use the Voltmeter (V) to take Voltage readings. Fill in the last column in the table using Ohm's Law: V = IR, so R = V/I.
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[Image unavailable: Lab_VoltageSeries2.png]
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Flag question: Question 9Question 94 pts
Resistors in Series:
(a) Why do you think the voltage for the resistors behaves the way it does?
(b) Why do you think the current for the resistors behaves the way it does?
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Resistors in Parallel
Construct the Circuit shown in Figure 1 below. Use the same resistors you used for the Series Circuit. Move the Ammeter to take current readings in different places, as shown in Figure 2. Then use the Voltmeter to take Voltage readings. Fill in the last column in the table using Ohm's Law: V = IR, so R = V/I.
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[Image unavailable: Lab_VoltageParallel2.png]
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Flag question: Question 11Question 114 pts
Resistors in Parallel
a. How does the total resistance compare to the individual resistances? Explain what you think is happening.
b. Look up the formula for the total resistance of resistors connected in parallel. Does your data fit this relationship?
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Summarize the differences between Resistors in Series and Parallel by filling in:
Series:
How total Voltage is related to individual Voltages:
How total Current is related to individual Currents:
How total Resistance is related to individual Resistances:
Parallel:
How total Voltage is related to individual Voltages:
How total Current is related to individual Currents:
How total Resistance is related to individual Resistances: