| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.08 |
| Score | 0% | 62% |
The formula specifying Ohm's law is which of the following?
V = I2R |
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\(V = {I \over R}\) |
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V = IR |
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\(V = {R \over I}\) |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Inductance is a factor in which of the following?
determining energy stored by a capacitor |
|
batteries connected in serial |
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an AC circuit |
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a DC circuit |
Inductance is a property of an AC circuit (or a component in an AC circuit) that quantifies resistance to changes in current. The current in an AC circuit is continuously changing and inductive reactance (the opposition to change) depends both on the inductance of the circuit or component and the rate at which the current is changing.
A __________ electric current produces a magnetic field proportional to the amount of current flow.
high voltage |
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moving |
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low voltage |
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stationary |
A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.
Which of these materials is not a good conductor of electricity?
air |
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copper |
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tin |
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gold |
All conductors have resistance and the amount of resistance varies with the element. In general, metals make the best conductors of electricity and non-metals make the worst conductors of electricity.
| 6V 80A | |
| 24V 40A | |
| 8V 60A | |
| 48V 10A |
Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 48V 10A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yielding a 6V 80A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 24V 40A configuration.