| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.41 |
| Score | 0% | 68% |
Which of the following is the formula for calculating electrical power?
\(P = {V \over I}\) |
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P = I2V |
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\(P = {I \over V}\) |
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P = IV |
Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.
A diode to an electronic circuit is like a _______________ to a city?
parking lot |
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traffic light |
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highway |
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one-way street |
A diode allows current to pass easily in one direction and blocks current in the other direction.
The formula specifying Ohm's law is which of the following?
\(V = {R \over I}\) |
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V = I2R |
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\(V = {I \over R}\) |
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V = IR |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
This circuit diagram represents a(n):
rectifier |
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series circuit |
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series-parallel circuit |
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parallel circuit |
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.
What is the voltage of most household electrical systems in the United States?
220V |
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110V |
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60Hz |
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60V |
Most households use electricity with a voltage of 110V.