| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
From what energy do photovoltaic cells produce electrical energy?
sun |
|
nuclear |
|
magnetic |
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chemical |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
An amplifier is most similar in function to which of the following:
transistor |
|
step-down transformer |
|
capacitor |
|
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.
Using a fuse with a current rating higher than that required by a circuit:
makes the circuit less safe |
|
makes no difference |
|
is required |
|
is recommended |
A fuse is a type of low resistance resistor that stops current flow in a circuit in response to a larger than intended electric current flow. Using a fuse with a higher current rating than required by a circuit is less safe as it could potentially allow overcurrent and risk a fire or heat-related equipment damage.
The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.
closed |
|
parallel |
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series |
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series-parallel |
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 the formula for calculating electrical power?
P = I2V |
|
\(P = {V \over I}\) |
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P = IV |
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\(P = {I \over V}\) |
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.