| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.14 |
| Score | 0% | 63% |
Why is an insulator a poor conductor of electricity?
an insulator has few free electrons |
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an insulator is made of organic material |
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an insulator has many free electrons |
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an insulator is made of inorganic material |
Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.
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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transformer |
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DC source |
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transistor |
In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.
This circuit component symbol represents a(n):
capacitor |
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DC source |
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transformer |
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AC source |
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.
Which of the following is the same for each branch of a parallel circuit?
voltage |
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resistance |
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power |
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current |
In a parallel circuit, each load occupies a separate parallel path in the circuit and the input voltage is fully applied to each path. Unlike a series circuit where current (I) is the same at all points in the circuit, in a parallel circuit, voltage (V) is the same across each parallel branch of the circuit but current differs in each branch depending on the load (resistance) present.