| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.64 |
| Score | 0% | 73% |
| 540 W | |
| 600 W | |
| 592 W | |
| 1200 W |
The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.
parallel |
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series-parallel |
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series |
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closed |
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.
You would measure the amount of resistance at a certain point in a circuit with a(n):
potentiometer |
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voltmeter |
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ammeter |
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ohmmeter |
Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.
Silver and gold are among the most highly conductive elements. Why is copper used much more often as a conductor in electrical circuits?
copper is durable and relatively cheap |
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silver and gold are costly |
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silver and gold are brittle |
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all of these |
All conductors have resistance and the amount of resistance varies with the element. But, resistance isn't the only consideration when choosing a conductor as the most highly conductive elements like silver and gold are also more expensive and more brittle than slightly less conductive elements like copper. A balance needs to be struck between the electrical qualities of a material and its cost and durability.
From what energy do photovoltaic cells produce electrical energy?
magnetic |
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chemical |
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sun |
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nuclear |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.