| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.28 |
| Score | 0% | 66% |
The formula specifying Ohm's law is which of the following?
V = IR |
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V = I2R |
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\(V = {R \over I}\) |
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\(V = {I \over R}\) |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
An amplifier is most similar in function to which of the following:
transistor |
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step-down transformer |
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capacitor |
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step-up transformer |
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.
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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limit the current in the circuit |
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control the voltage in the circuit |
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moderate the heat 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.
This circuit diagram represents a(n):
series-parallel circuit |
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open circuit |
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series circuit |
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parallel circuit |
A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.
In electrical wiring, which of the following are proportional?
the length of the wire and the amount of the current |
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the length of the wire and the amount of the voltage |
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the diameter of the wire and the amount of the current |
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the diameter of the wire and the amount of the voltage |
Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.