| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.34 |
| Score | 0% | 67% |
What is the voltage of most household electrical systems in the United States?
60V |
|
60Hz |
|
110V |
|
220V |
Most households use electricity with a voltage of 110V.
Capacitors are charged by what type of current?
alternating |
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direct |
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high voltage |
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low voltage |
Capacitors store voltage 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.
Which of the following is a difference between a circuit breaker and a fuse?
a circuit breaker can be reused |
|
a fuse is cheaper than a circuit breaker |
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all of these |
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a fuse responds more quickly than a circuit breaker |
Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.
In a series circuit, which of the following is the same across all branches of the circuit?
current |
|
voltage |
|
resistance |
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conductance |
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.
Which of the following is not a purpose of a resistor in an electrical circuit?
limit the current in the circuit |
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multiply the current in the circuit |
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moderate the heat 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.