| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.54 |
| Score | 0% | 71% |
Electrons will flow as current from areas of __________ potential (concentration of electrons) to areas of __________ potential.
high, high |
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high, low |
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low, high |
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low, low |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
Which of the following is not a characteristic of a step-up transformer?
the primary voltage is higher than the secondary voltage |
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has more turns in the secondary winding than in the primary winding |
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the secondary voltage is higher than the primary voltage |
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increases voltage |
As their names indicate, a step-up transformer is used to step up or increase voltage and a step-down transformer is used to step down or decrease voltage. In a step-up transformer, the secondary voltage is higher than the primary voltage and it has more turns in the secondary winding than in the primary winding.
| 5.25 A | |
| 5 A | |
| 5.5 A | |
| 3.5 A |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for current, I = \( \frac{V}{R} \) = \( \frac{245}{70} \) = 3.5 A
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.
Why does current in an electric circuit create heat?
the wire in the circuit burns when current passes through |
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voltage is naturally hot |
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heat is created when the current overcomes resistance in the wire |
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current is naturally hot |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.