Ages 11–12🔬 Science9 verified questions on this shelf
Current, voltage, and what they measure
Understand that electric current is the rate of flow of charge (measured in amperes using an ammeter), and that potential difference (voltage) is the energy transferred per unit charge (measured in volts using a voltmeter)
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Question 1 of 3
A student records the magnetic force between two identical bar magnets placed at different distances, as shown in the table below.
| Distance (cm) | Magnetic force (N) |
|---------------|-------------------|
| 2 | 8.0 |
| 4 | 2.0 |
| 6 | 0.9 |
The force decreases as the distance increases. Which question would best help the student determine the factor that most affects the strength of the magnetic force?
Question 2 of 3
Students measured the magnetic force between two identical bar magnets at three different separations. The data are:
| Separation (cm) | Force (N) |
|-----------------|----------|
| 2 | 0.80 |
| 4 | 0.20 |
| 6 | 0.09 |
Based on this data, which of the following changes would most increase the magnetic force between the magnets?
Question 3 of 3
Device A moves 0.5 coulombs of charge through a circuit that has a potential difference of 8 volts. Device B moves 1.0 coulomb of charge through a circuit that has a potential difference of 4 volts. Which device gets more total energy from its circuit?
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