| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
The formula specifying Ohm's law is which of the following?
\(V = {I \over R}\) |
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\(V = {R \over I}\) |
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V = IR |
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V = I2R |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Which of the following is not a purpose of a resistor in an electrical circuit?
multiply the current in the circuit |
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moderate the heat in the circuit |
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limit the current in the circuit |
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control the voltage in the circuit |
Resistors can be chosen in a wide variety of values to control the voltage in a circuit, limit the current, or moderate the heat produced by the components in the circuit.
Which of the following statements about electrical resistance is true?
the more resistive the conductor is the slower electron flow will be |
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the more resistive the conductor is the faster electron flow will be |
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the less resistive the conductor is the slower electron flow will be |
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electrically conductive materials have no resistive properties |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
An engineer who wants to document an electric circuit would create which of the following?
a schematic |
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a matrix |
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a layout |
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a blueprint |
A schematic is the proper name for a drawing of an electric or electronic circuit.
A capacitor is often used for which of the following purposes?
to maintain power in a circuit when the primary power source is disconnected |
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to convert alternating current into direct current |
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as a primary power source |
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to allow a small amount of current to control a large amount of current |
Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.