| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.27 |
| Score | 0% | 65% |
Which of the following is not a characteristic of a step-up transformer?
has more turns in the secondary winding than in the primary winding |
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the primary voltage is higher than the secondary voltage |
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increases voltage |
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the secondary voltage is higher than the primary 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.
Which of the following is not a purpose of a resistor in an electrical circuit?
limit the current in the circuit |
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multiply the current in the circuit |
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moderate the heat 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 valence shell of n insulator is how full of electrons?
more than half full |
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half full |
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less than half full |
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empty |
Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.
| 100 Ω | |
| 102 Ω | |
| 90 Ω | |
| 150 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 = \( \frac{V}{I} \) = \( \frac{450}{4.5} \) = 100 Ω
A diode to an electronic circuit is like a _______________ to a city?
traffic light |
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highway |
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one-way street |
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parking lot |
A diode allows current to pass easily in one direction and blocks current in the other direction.