| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.61 |
| Score | 0% | 72% |
Resistance and current are __________ proportional.
inversely |
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exponentially |
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not |
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directly |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.
The formula specifying Ohm's law is which of the following?
\(V = {R \over I}\) |
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V = I2R |
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V = IR |
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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.
From what energy do photovoltaic cells produce electrical energy?
magnetic |
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sun |
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chemical |
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nuclear |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
Resistance is measured in:
ohms |
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coulombs |
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volts |
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amperes |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.
What is the primary difference between a rectifier and an inverter?
a rectifier strips out the DC portion of electricity while an inverter strips out the AC portion |
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a rectifier converts a DC input to AC while an inverter converts an AC input to DC |
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a rectifier converts an AC input to DC while an inverter converts a DC input to AC |
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a rectifier strips out the AC portion of electricity while an inverter strips out the DC portion |
A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.