| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
You would measure the amount of current through a circuit with a(n):
battery |
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ammeter |
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potentiometer |
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voltmeter |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). An ammeter is used to measure the electric current in a circuit.
In an electronic circuit, a thermocouple can be used to:
open or close a circuit at a designated temperature |
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keep the circuit at a designated safe temperature |
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increase or decrease the temperature of a component in the circuit |
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link the temperature of one component in the circuit to that of another component in the circuit |
A thermocouple is a temperature sensor that consists of two wires made from different conductors. The junction of these two wires produces a voltage based on the temperature difference between them and can be used like a switch to open or close the circuit at a designated temperature.
In electrical wiring, which of the following are proportional?
the length of the wire and the amount of the voltage |
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the diameter of the wire and the amount of the voltage |
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the diameter of the wire and the amount of the current |
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the length of the wire and the amount of the current |
Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.
| 721.5 V | |
| 240 V | |
| 1440 V | |
| 720 V |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
V = \( I \times R \) = \( 9 \times 80 \) = 720 V
The most common circuit configuration is:
household |
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parallel |
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series-parallel |
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series |
Circuits are not limited to only series or only parallel configurations. Most circuits contain a mix of series and parallel segments. A good example is a household circuit breaker. Electrical outlets in each section of the house are wired in parallel with the circuit breaker for that section wired in series making it easy to cut off electricity to the parallel parts of the circuit when needed.