| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.67 |
| Score | 0% | 73% |
Capacitors store:
resistance |
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electricity |
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current |
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capacitance |
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.
| 43 Ω | |
| 42 Ω | |
| 60 Ω | |
| 40 Ω |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for resistance, R = \( \frac{V}{I} \) = \( \frac{40}{1} \) = 40 Ω
Which of the following is a difference between a circuit breaker and a fuse?
a circuit breaker can be reused |
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a fuse is cheaper than a circuit breaker |
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a fuse responds more quickly than a circuit breaker |
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all of these |
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.
Longer the electrical wires mean _______________ voltage drop.
lesser |
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greater |
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complete |
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diminishing |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
An amplifier is most similar in function to which of the following:
step-up transformer |
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transistor |
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step-down transformer |
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capacitor |
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.