| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.22 |
| Score | 0% | 64% |
Which of the following will increase the magnetic field produced by the electric current in a wire?
wind the wire into a coil |
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construct the wire from insulative material |
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construct the wire from conductive material |
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wrap the wire around a ceramic core |
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.
Voltage and current are __________ proportional.
indirectly |
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inversely |
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directly |
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not |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
An engineer who wants to document an electric circuit would create which of the following?
a blueprint |
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a schematic |
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a matrix |
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a layout |
A schematic is the proper name for a drawing of an electric or electronic circuit.
This circuit component symbol represents a(n):
AC source |
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capacitor |
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DC source |
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transformer |
Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of direct current (DC) is a battery.
An amplifier is most similar in function to which of the following:
capacitor |
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step-down transformer |
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step-up transformer |
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transistor |
An amplifier is a device that takes a small input signal and creates a larger output signal. This makes it most similar to a step-up transformer which takes a smaller input voltage and creates a larger output voltage.