| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
From what energy do photovoltaic cells produce electrical energy?
chemical |
|
magnetic |
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nuclear |
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sun |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
Which of the following is not a purpose of a resistor in an electrical circuit?
multiply the current in the circuit |
|
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.
The joule is a unit of measurement for:
resistance |
|
power |
|
capacitance |
|
energy |
The joule is a unit of measurement for energy.
An amplifier is most similar in function to which of the following:
capacitor |
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step-up transformer |
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transistor |
|
step-down 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 will help to prevent a short circuit?
transistor |
|
diode |
|
fuse |
|
resistor |
Fuses are thin wires that melt when the current in a circuit exceeds a preset amount. They help prevent short circuits from damaging circuit components when an unusually large current is applied to the circuit, either through component failure or spikes in applied voltage.