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CASTLE Unit 6: Worksheet 1
1. Based on your experiments, how do you know a voltmeter is a device that can be utilized to
measure pressure differences? What units are used for measuring electric pressure? What is
another term uses for electric pressure?
2. What would happen if you connected a voltmeter in series with a circuit component? Why is this
not appropriate for good measurements?
3. A good measuring device does not significantly interfere with the circuit being measured. In
terms of being a good measuring device describe:
a) Whether the resistance of the voltmeter is high or low.
b) How should the voltmeter be connected in the circuit in relation to where you want to know
the electric pressure difference?
c) Why is it voltmeter need to have the resistance it does in order to be a good measuring
device?
4. You have three bulbs connected in series. The voltage drop across each bulb is 2.0 Volts. Are
the bulbs identical? How do you know? What is the voltage across the battery?
5. You have four bulbs connected in series. The voltage drop across the battery is 12 Volts. The
voltage drop across bulb A is equal to 1 Volt, the drop across bulb B is 5 volts, the drop across
bulb C is equal to 4 volts.
What is the voltage drop across bulb D?
Which bulb has the greatest resistance?
Which bulb has the smallest resistance?
©Modeling Workshop Project 2004
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C6 WS 1 v3.1
6. You have five bulbs connected in parallel. The voltage drop across the first branch is 10 Volts.
What is the voltage drop across the battery? What is the voltage drop across the other branches?
7. Complete the circuit below with the correct pressure difference values for each component by
recording them in the spaces provided. Note that the voltmeter placed across the battery shows a
value of 6.Volts.
8. Look at the circuit below. Color code the circuit and determine the voltage values across each
bulb and the battery as closely as you can. You may assume that each cell in the battery has a
pressure difference of 4V.
©Modeling Workshop Project 2004
2
C6 WS 1 v3.1