| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
You would measure the amount of resistance at a certain point in a circuit with a(n):
voltmeter |
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ammeter |
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ohmmeter |
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potentiometer |
Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.
Which of the following can conduct electricity under some conditions but not others?
resistor |
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conductor |
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semiconductor |
|
insulator |
Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.
This circuit component symbol represents a(n):
AC source |
|
DC source |
|
capacitor |
|
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.
| series | |
| series-parallel | |
| parallel | |
| orthogonal |
Connecting the 4 batteries in series multiplies their voltage while keeping their current the same yielding a 24V 20A configuration. Connecting the 4 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 6V 80A configuration. Using a series-parallel connection, 2 batteries can be connected in series and 2 can be connected in parallel resulting in a 12V 40A configuration.
The valence shell of a semiconductor is how full of electrons?
empty |
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half full |
|
less than half full |
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more than half full |
Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.